Composition of Post classes and normal forms of Boolean functions.

Miguel Couceiro Stephan Foldes Erkko Lehtonen Composition of Post classes and normal forms of Boolean functions. 3223-3243 2006 306 Discrete Mathematics 24 http://dx.doi.org/10.1016/j.disc.2006.06.014 db/journals/dm/dm306.html#CouceiroFL06