共 7 条
- [1] Behzad M., 1979, GRAPHS DIGRAPHS
- [2] COCKAYNE EJ, 1978, THEORY APPLICATIONS
- [3] FINK JF, UNPUB PERIODICA MATH
- [4] JACOBSON MS, UNPUB ARS COMBINATOR
- [5] Liu C. L., 1968, INTRO COMBINATORIAL
- [7] VIZING VG, 1965, DOKL AKAD NAUK SSSR+, V164, P729