1. The strong chromatic number of partial triple systems;Colbourn;Discrete Appl. Math.,1988
2. Completeness criteria for partial functions of the algebra of logic and many-valued logics;Freivald;Dokl. Akad. Nauk. SSSR,1966
3. Functional completeness for not everywhere defined functions of the algebra of logic;Freivald;Diskret. Analiz.,1966
4. Computers and Intractability. A Guide to the Theory of NP-completeness;Garey,1979
5. Le treillis des clones partiels sur un univers fini et ses coatomes;Haddad,1986