Arthur T. Pu Generalized Decomposition of Incomplete Finite Automata [Citation Graph (0, 0)][DBLP] Information and Control, 1968, v:13, n:1, pp:1-19 [Journal]
W. E. Hartnett Generalization of Tests for Certain Properties of Variable-Length Codes [Citation Graph (0, 0)][DBLP] Information and Control, 1968, v:13, n:1, pp:20-45 [Journal]