Natural language at the computer : proceedings / Scientific Symposium on Syntax and Semantics for Text Processing and Man-Machine-Communication, held on the occasion of the 20th anniversary of the Science Center Heidelberg of IBM Germany, Heidelberg, FRG, February 25, 1988 ; A. Blaser, ed.

Speech and natural language : proceedings of a workshop, held at Pacific Grove, California, February 19-22, 1991 / sponsored by: Defense Advanced Research Projects Agency, Information Science and Technology Office.

Computational linguistics and intelligent text processing : 18th International Conference, CICLing 2017, Budapest, Hungary, April 17-23, 2017, revised selected papers / Alexander Gelbukh (ed.).

Natural language understanding and logic programming, III : proceedings of the Third International Workshop on Natural Language Understanding and Logic Programming, Stockholm, Sweden, 23-25 January, 1991 / edited by Charles Grant Brown and Gregers Koch.