AAAI-91 : proceedings Ninth National Conference on Artificial Intelligence, July 14-19, 1991.
National Conference on Artificial Intelligence(9th :1991)
American Association for Artificial Intelligence.
Menlo Park [Calif.] : AAAI Press ; Cambridge, Mass. : MIT Press,
1991.
"Sponsored by the American Association for Artificial Intelligence."
Includes bibliographical references and index.
Artificial intelligence