共 4 条
[1]
GUBA VS, 1986, IZV VUZ MAT+, P12
[2]
Lyndon R. C., 1977, Combinatorial group theory, V89
[3]
Margolis S. W., 1993, International Journal of Algebra and Computation, V3, P79, DOI 10.1142/S021819679300007X
[4]
*NOV, 1990, KOUR NOT