Data abstraction, data bases and conceptual modelling (Position Paper)

J.W. Thatcher

ACM SIGPLAN Notices

J.A. Goguen, J.W. Thatcher, et al.

Journal of the ACM

J.A. Goguen, J.W. Thatcher, et al.

Journal of the Franklin Institute

J.B. Wright, E.G. Wagner, et al.

Theoretical Computer Science