Sudhakar M. Reddy Note on Self-Checking Checkers. 1100-1102 1974 23 IEEE Trans. Computers 10 https://doi.org/10.1109/T-C.1974.223811 http://doi.ieeecomputersociety.org/10.1109/T-C.1974.223811 db/journals/tc/tc23.html#Reddy74
