1. Boros, E., Ibaraki, T., Makino, K.: Error-free and best-fit extensions of partially defined Boolean functions. Inf. Comput. 140, 254–283 (1998)
2. Boros, E., Ibaraki, T., Makino, K.: Extensions of partially defined boolean functions with missing data. Technical Report 6-96, RUTCOR Research Report RRR, Rutgers University, New Brunswick, NJ (1996)
3. Garey, M., Johnson, D.: Computers and Intractability: A Guide to the Theory of NP-Completeness. W.H. Freeman, San Francisco (1979)
4. Genesereth, M., Nilsson, N.: Logical Foundations of Artificial Intelligence. Morgan Kaufmann, Los Altos, CA (1987)
5. Hammer, P., Kogan, A.: Horn functions and their dnfs. Inf. Process. Lett. 44, 23–29 (1992)