1. G. Petasis, V. Karkaletsis, G. Paliouras, A. Krithara, E. Zavitsanos, “Ontology Population and Enrichment: State of the Art”. In “Knowledge-Driven Multimedia Information Extraction and Ontology Evolution”, G. Paliouras, C.D. Spyropoulos, G. Tsatsaronis (Eds.), Lecture Notes in Artificial Intelligence, Vol. 6050, pp. 134 – 166, Springer, ISBN 978-3-642-20794-5, 2011.
  2. V. Karkaletsis, P. Fragkou, G. Petasis, E. Iosif, “Ontology Based Information Extraction from Text”. In “Knowledge-Driven Multimedia Information Extraction and Ontology Evolution”, G. Paliouras, C.D. Spyropoulos, G. Tsatsaronis (Eds.), Lecture Notes in Artificial Intelligence, Vol. 6050, pp. 89 – 109, Springer, ISBN 978-3-642-20794-5, 2011.
  3. G. Petasis. “TkRibbon: Windows Ribbons for Tk”. In Proceedings of the 17th Annual Tcl/Tk Conference (Tcl 2010), Hilton Suites Chicago/Oakbrook Terrace, 10 Drury Lane, Oakbrook Terrace, Illinois, United States 60181, October 11 – 15, 2010.
  4. G. Petasis. “TkGecko: Another Attempt for an HTML Renderer for Tk”. In Proceedings of the 17th Annual Tcl/Tk Conference (Tcl 2010), Hilton Suites Chicago/Oakbrook Terrace, 10 Drury Lane, Oakbrook Terrace, Illinois, United States 60181, October 11 – 15, 2010.
  5. G. Petasis. “TileQt and TileGtk: current status”. In Proceedings of the 17th Annual Tcl/Tk Conference (Tcl 2010), Hilton Suites Chicago/Oakbrook Terrace, 10 Drury Lane, Oakbrook Terrace, Illinois, United States 60181, October 11 – 15, 2010.
  6. G. Petasis. “Ellogon and the challenge of threads”. In Proceedings of the 17th Annual Tcl/Tk Conference (Tcl 2010), Hilton Suites Chicago/Oakbrook Terrace, 10 Drury Lane, Oakbrook Terrace, Illinois, United States 60181, October 11 – 15, 2010.
  7. G. Petasis. “TkDND: a cross-platform drag’n’drop package”. In Proceedings of the 17th Annual Tcl/Tk Conference (Tcl 2010), Hilton Suites Chicago/Oakbrook Terrace, 10 Drury Lane, Oakbrook Terrace, Illinois, United States 60181, October 11 – 15, 2010.
  8. G. Petasis and D. Petasis. “BlogBuster: A tool for extracting corpora from the blogosphere”. In Proceedings of the 7th Language Resources and Evaluation Conference (LREC 2010), Valletta, Malta, May 19 – 21, 2010. [Poster]
  9. G. Petasis, V. Karkaletsis, A. Krithara, G. Paliouras and C.D. Spyropoulos. “Semi-automated ontology learning: the BOEMIE approach”. In Proceedings of the International Workshop on Inductive Reasoning and Machine Learning on the Semantic Web (IRMLeS 2009), 6th European Semantic Web Conference (ESWC 2009), Hersonissos, Crete, Greece, May 31, 2009.
  10. S. Castano, I.S.E. Peraldi, A. Ferrara, V. Karkaletsis, A. Kaya, R. Möller, S. Montanelli, G. Petasis, and M. Wessel, “Multimedia Interpretation for Dynamic Ontology Evolution”. In Journal of Logic and Computation, September 2008. http://logcom.oxfordjournals.org/cgi/content/abstract/exn049
  11. D. Spiliotopoulos, G. Petasis, and G. Kouroupetroglou, “A Framework for Language-Independent Analysis and Prosodic Feature Annotation of Text Corpora”. In Proceedings of the 11th International Conference on Text, Speech and Dialogue (TSD 2008), Lecture Notes in Artificial Intelligence 5246, Text Speech and Dialogue, Springer-Verlag Berlin Heidelberg, pp. 517 – 524, Brno, Czech Republic, September 8 – 12, 2008.
  12. G. Petasis, V. Karkaletsis, G. Paliouras, C. D. Spyropoulos, “Learning context-free grammars to extract relations from text ”. In Proceedings of the 18th European Conference on Artificial Intelligence (ECAI 2008), pp. 303 – 307, Patras, Greece, July 2008.
  13. P. Fragkou, G. Petasis, A. Theodorakos, V. Karkaletsis, and C. D. Spyropoulos, “BOEMIE ontology-based text annotation tool”. In Proceedings of the 6th Language Resources and Evaluation Conference (LREC 2008), Marrakech (Morocco), May 28 – 30, 2008.
  14. G. Petasis, P. Fragkou, A. Theodorakos, V. Karkaletsis, and C. D. Spyropoulos, “Segmenting HTML pages using visual and semantic information”. In Proceedings of the 4th Web as a Corpus Workshop (WAC2008), 6th Language Resources and Evaluation Conference (LREC 2008), pp. 18 – 25, Marrakech (Morocco), June 1, 2008.
    Procedings: The 4th Web as Corpus: Can we do better than Google?
  15. Silvana Castano, Sofia Espinosa, Alfio Ferrara, Vangelis Karkaletsis, Atila Kaya, Sylvia Melzer, Ralf Moller , Stefano Montanelli, and Georgios Petasis, “Ontology Dynamics with Multimedia Information: The BOEMIE Evolution Methodology”. In Proceedings of International Workshop on Ontology Dynamics (IWOD) ESWC 2007 Workshop, pp. 41 – 54, Innsbruck, Austria, 7 June 2007. (download – http://kmi.open.ac.uk/events/iwod/)
  16. D. Spiliotopoulos, G. Petasis, and G. Kouroupetroglou, “Prosodically Enriched Text Annotation for High Quality Speech Synthesis”. In Proceedings of the 10th International Conference on Speech and Computer (SPECOM-2005), pp. 313 – 316, Patras, Greece, 17 – 19 October, 2005.
  17. G. Petasis, G. Paliouras, C. D. Spyropoulos and C. Halatsis, “eg-GRIDS: Context-Free Grammatical Inference from Positive Examples using Genetic Search”. In Proceedings of the 7th International Colloquium on Grammatical Inference (ICGI 2004), Lecture Notes in Artificial Intelligence 3264, pp. 223 – 234, Springer, 2004.
  18. G. Petasis, V. Karkaletsis, C. Grover, B. Hachey, M. T. Pazienza, M. Vindigni, J. Coch: “Adaptive, Multilingual Named Entity Recognition in Web Pages”. In Proceedings of the 16th European Conference on Artificial Intelligence (ECAI 2004), pp. 1073 – 1074, Valencia, Spain, August 22 – 27, 2004. [Extended Version]
  19. G. Petasis, G. Paliouras, V. Karkaletsis, C. Halatsis, and C.D. Spyropoulos, “e-GRIDS: Computationally Efficient Grammatical Inference from Positive Examples”. GRAMMARS, (7), pp. 69 – 110, 2004. (http://grammars.grlmc.com/special.asp) [Technical Report referenced in the paper]
  20. B. Gatos, S. J. Perantonis, V. Maragos, V. Karkaletsis and G. Petasis, “Text Area Identification in Web Images”. In Proceedings of the Panhellenic Conference in Artificial Intelligence (SETN 04), Lecture Notes in Artificial Intelligence, n. 3025, pp. 82 – 92, Springer Verlag, Samos, Greece, May 2004.
  21. G. Petasis, V. Karkaletsis, D. Farmakiotou, I. Androutsopoulos, and C.D. Spyropoulos. “A Greek Morphological Lexicon and its Exploitation by Natural Language Processing Applications”. In Lecture Notes on Computer Science (LNCS), vol. 2563, "Advances in Informatics - Post-proceedings of the 8th Panhellenic Conference in Informatics", Springer Verlag, pp. 401 – 419, 2003. (http://www.springerlink.com/content/hcdjrlvj5nlybf5c/ )
  22. G. Petasis, V. Karkaletsis, G. Paliouras and C. D. Spyropoulos, “Using the Ellogon Natural Language Engineering Infrastructure”. In Proceedings of the Workshop on Balkan Language Resources and Tools, 1st Balkan Conference in Informatics (BCI’2003), Thessaloniki, Greece, November 21, 2003. (http://www.iit.demokritos.gr/skel/bci03_workshop/papers/SESSION5_2-23_Petasis.pdf)
  23. G. Petasis, V. Karkaletsis, and C. D. Spyropoulos, “Cross-lingual Information Extraction from Web pages: the use of a general-purpose Text Engineering Platform”. In Proceedings of the 4th International Conference on Recent Advances in Natural Language Processing (RANLP 2003), Borovets, Bulgaria, pp 381 – 388, September 10 – 12, 2003.
  24. G. Petasis, V. Karkaletsis, G. Paliouras, I. Androutsopoulos and C. D. Spyropoulos, “Ellogon: A New Text Engineering Platform”. In Proceedings of the 3rd International Conference on Language Resources and Evaluation (LREC 2002), Las Palmas, Canary Islands, Spain, vol. I, pp. 72 – 78, May 2002.
  25. C. Grover, S. McDonald, D. N. Gearailt, V. Karkaletsis, D. Farmakiotou, G. Samaritakis, G. Petasis, M. T. Pazienza, M. Vindigni, F. Vichot and F. Wolinski, “Multilingual XML-Based Named Entity Recognition for E-Retail Domains”. In Proceedings of the 3rd International Conference on Language Resources and Evaluation (LREC 2002), Las Palmas, Canary Islands, Spain, May 2002.
  26. D. Farmakiotou, V. Karkaletsis, I. Koutsias, G. Petasis, C.D. Spyropoulos, “PatEdit: An Information Extraction Pattern Editor for Fast System Customization”. In Proceedings of the 3rd International Conference on Language Resources and Evaluation (LREC 2002), Las Palmas, Spain, May 2002.
  27. D. Farmakiotou, V. Karkaletsis, G. Samaritakis, G. Petasis, and C.D. Spyropoulos “Named Entity Recognition from Greek Web Pages”, Proceedings Companion Volume of 2nd Hellenic Conference on Artificial Intelligence (SETN-02), I.P. Vlahavas and C.D. Spyropoulos (eds), 2002, pp. 91 – 102.
  28. G. Petasis, V. Karkaletsis, D. Farmakiotou, G. Samaritakis, I. Androutsopoulos, C. D. Spyropoulos, “A Greek Morphological Lexicon and its Exploitation by a Greek Controlled Language Checker”. In Proceedings of the 8th Panhellenic Conference on Informatics, Nicosia, Cyprus, vol. 1, pp. 80 – 89, 8 – 10 November 2001.
  29. G. Petasis, F. Vichot, F. Wolinski, G. Paliouras, V. Karkaletsis, C. D. Spyropoulos, “Using Machine Learning to Maintain Rule-based Named – Entity Recognition and Classification Systems”. In Proceedings of the 39th Conference of Association for Computational Linguistics (ACL-EACL 2001), pp. 426 – 433, July 9 – 11 2001, Toulouse, France.
  30. V. Karkaletsis, G. Samaritakis, G. Petasis, D. Farmakiotou, I. Androutsopoulos, S. Markantonatou, and C.D. Spyropoulos, “A Controlled Language Checker Based on the Ellogon Text Engineering Platform”. In Proceedings of the 2nd Meeting of the North American Chapter of the Association for Computational Linguistics (NAACL 2001), demonstration notes (companion volume to the proceedings), pp. 74 – 75, Carnegie Mellon University, Pittsburgh, USA, 2001.
  31. G. Petasis, S. Petridis, G. Paliouras, V. Karkaletsis, S. Perantonis, and C.D. Spyropoulos, “Symbolic and Neural Learning of Named-Entity Recognition and Classification Systems in Two Languages”, In Advances in Computational Intelligence and Learning: Methods and Applications, H–J. Zimmermann, G. Tselentis, M. van Someren and G. Dounias (eds), Kluwer Academic Publishers, 2001.
  32. G. Petasis, S. Petridis, G. Paliouras, V. Karkaletsis, S. J. Perantonis, C. D. Spyropoulos, “Symbolic and Neural Learning for Named-Entity Recognition”. In Proceedings of European Best Practice Workshops and Symposium on Computational Intelligence and Learning (COIL 2000), pp. 58 – 66, June 19 – 23 2000, Chios, Greece.
  33. G. Petasis, A. Cucchiarelli, P. Velardi, G. Paliouras, V. Karkaletsis, C. D. Spyropoulos, “Automatic adaptation of Proper Noun Dictionaries through cooperation of machine learning and probabilistic methods”. In Proceedings of the 23rd Annual International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR), pp. 128 – 135, July 24 – 28 2000, Athens, Greece.
  34. G. Paliouras, V. Karkaletsis, G. Petasis and C. D. Spyropoulos, “Learning Decision Trees for Named-Entity Recognition and Classification”. In Proceedings of the 14th European Conference on Artificial Intelligence (ECAI 2000), August 20 – 25 2000, Berlin, Germany.
  35. G. Petasis, “Machine Learning and Named-Entity Recognition”. Presentation in the 8th ELSNET European Summer School on Language and Speech Communication on the subject of Text and Speech Triggered Information Access (TeSTIA 2000), Chios, Greece, July 15 – 30, 2000.
  36. G. Petasis, G. Paliouras, V. Karkaletsis, C.D. Spyropoulos and I. Androutsopoulos, “Resolving Part-of-Speech Ambiguity in the Greek Language Using Learning Techniques”. In Fakotakis, N. et al. (Eds.), Machine Learning in Human Language Technology (Proceedings of the ECCAI Advanced Course on Artificial Intelligence – ACAI ’99), pp. 29 – 34, July 5 – 16, 1999, Chania, Greece.
  37. G. Petasis, “Exploiting Learning in Bilingual Named Entity Recognition”. In Proceedings of the ECCAI Advanced Course on Artificial Intelligence (ACAI ‘99), July 5 – 16, 1999, Chania, Greece.
  38. G. Petasis, G. Paliouras, V. Karkaletsis, C. D. Spyropoulos, I. Androutsopoulos, “Using Machine Learning Techniques for Part-Of-Speech Tagging in the Greek Language”. In “Advances in Informatics: Proceedings of the Panhellenic Conference on Informatics (EPY)”, D.I. Fotiadis and S.D. Nikolopoulos (eds.), pp. 273 – 281, World Scientific, 2000 (Post-Proceedings volume of the 7th Hellenic Conference on Informatics, August 26 – 29 1999, Ioannina, Greece).
  39. V. Karkaletsis, G. Paliouras, G. Petasis, N. Manousopoulou and C. D. Spyropoulos, “Named-Entity Recognition from Greek and English Texts”. Journal of Intelligent and Robotic Systems v. 26, n.2, pp. 123 – 135, 1999.
  40. V. Karkaletsis, C. D. Spyropoulos, and G. Petasis, “Named Entity Recognition from Greek texts: the GIE Project”. In “Advances in Intelligent Systems: Concepts, Tools and Applications”, ed. S. Tzafestas, Kluwer Academic Publishers, Part II – Chapter 12, pp. 131 – 142. (Presented at the 3rd European Robotics Intelligent Systems & Control Conference (EURISCON’98), June 22 – 25 1998, Athens, Greece.)