Ralph-Johan Back, Michael J. Butler. Exploring Summation and Product Operators in the Refinement Calculus. In Bernhard Möller, editor, Mathematics of Program Construction, MPC 95, Kloster Irsee, Germany, July 17-21, 1995, Proceedings. Volume 947 of Lecture Notes in Computer Science, pages 128-158, Springer, 1995.
Abstract is missing.