共 7 条
[1]
Eilenberg S., 1974, AUTOMATA LANGUAGES M, VA
[3]
HAINES LH, 1969, J COMB THEORY, V6, P94
[4]
Kelley J. L., 1963, LINEAR TOPOLOGICAL S, P26
[5]
LALLEMENT G, 1979, SEMIGROUPS COMINATOR
[7]
THIERRIN G, 1974, INFORM CONTR, V24, P45