Symposium on Foundations of Computer Science.Symposium on Foundations of Computer Science (31st : 1990 : St. Louis, Miss)．2.IEEE Computer Society Pr.,1990.
Symposium on Foundations of Computer Science.Symposium on Foundations of Computer Science (31st : 1990 : St. Louis, Miss)．1.IEEE Computer Society Pr.,1990.
sponsored by the IEEE Technical Committee on Mathematical Foundations of Computing.Symposium on Foundations of Computer Science (30th : 1989 : Research Triangle Park, NC).IEEEComputer Society Pr.,1989.
.Symposium on Foundations of Computer Science (27th : Toronto, Ontario)：Formerly called the Annual Symposium on Switching and Automata Theory.IEEE Computer Society Pr.,1986.
