An Introduction to Formal Specification and Z by Ben Potter, Jane Sinclair and David Till, Prentice-Hall, 1991. - Z: An Introduction to Formal Methods (second edition) by Antoni Diller, John Wiley & Sons, 1994.
Andrew D. Gordon · Journal of Functional Programming · 1996
An Introduction to Formal Specification and Z by Ben Potter, Jane Sinclair and David Till, Prentice-Hall, 1991. - Z: An Introduction to Formal Methods (second edition) by Antoni Diller, John Wiley & Sons, 1994. - Volume 6 Issue 2