1. Sharing in nondeterminism;Astesiano,1979
2. Varieties of partial algebras;Börner;Beiträge zur Geometrie und Algebra (Contributions to Algebra and Geometry),1996
3. Categories, allegories and circuit design;Brown,1994
4. Automaten und Functoren;Budach,1975
5. Partial algebras—an introductory survey;Burmeister,1993