Lawrence T. Fisher Unateness Properties of and-Exclusive-or Logic Circuits. 166-172 1974 23 IEEE Trans. Computers 2 https://doi.org/10.1109/T-C.1974.223879 http://doi.ieeecomputersociety.org/10.1109/T-C.1974.223879 db/journals/tc/tc23.html#Fisher74
