Bjorne D Ed. Proceedings on VDM'90 VDM and Z-Formal methods in software development - Berlin Springer-Verlag 1990 - 579p. cm. - Lecture notes in computer science; 428 . Standard No.: 73454 Source: Textual Subjects--Topical Terms: Computer programming Dewey Class. No.: D65,8(B)92N70p1:N90, N0