1. < language > (ASL)
["Structured Algebraic Specifications: A Kernel Language", M. Wirsing, Theor Comput Sci 42, pp.123-249, Elsevier 1986].
2. < language > (ASF) A language for equational specification of abstract data types .
["Algebraic Specification", J.A. Bergstra et al, A-W 1989].
(1995-12-13)