共 50 条
- [23] Duality of graph homomorphisms COMBINATORICS, PAUL ERDOS IS EIGHTY, VOL. 2, 1996, 2 : 271 - 282
- [28] Fundamental cycles and graph embeddings Science in China Series A: Mathematics, 2009, 52 : 1920 - 1926
- [30] Fundamental cycles and graph embeddings SCIENCE IN CHINA SERIES A-MATHEMATICS, 2009, 52 (09): : 1920 - 1926