Issue No.04 - April (1971 vol.20)
G.J. Klir , IEEE
A universal logic primitive (ULP) is a logic function by which every logic function can be composed. The total number of all ULPs and all nondegenerate ULPs for n logic variables is derived and a procedure for determining all of them is presented.
Complete sets of functions, universal logic modules, universal logic primitives.
G.J. Klir, "On Universal Logic Primitives", IEEE Transactions on Computers, vol.20, no. 4, pp. 467-469, April 1971, doi:10.1109/T-C.1971.223269