1. Regular relations and bicartesian squares;Banach;Theoret. Comput. Sci.,1994
2. A. Carboni, G.M. Kelly and M.C. Pedicchio, Some remarks on Mal'cev and Goursat Categories, Sydney School of Mathematics and Statistics Report Vol. 93, Applied Categorical Structures, to appear.
3. Sur les Subsitutions Orthogonales;Goursat;Ann. Sci. Éc. Norm. Sup.,1889
4. Specification Case Studies;Hayes,1993
5. Specifications are not (necessarily) executable;Hayes;IEE Software Eng. J.,1989