1. A question-answering system using program generation;Kontos,1970
2. On the question-answering system DELFI and its application;Kontos,1971
3. A system using natural language for the solution of problems;Kontos;Technika Chronika,1971
4. Semantic interpretation of English-like questions using procedural components;Kontos,1972
5. Syntax-Directed processing of texts with action semantics;Kontos;Cybernetica,1980