任意基数集上的拟阵的约束
毛华,俞珊珊
Restriction of Matroids of Arbitrary Cardinality
MAO Hua,YU Shan-shan
河北大学学报(自然科学版) . 2009, (1): 22 -24 .  DOI: 10.3969/j.issn.1000-1565.2009.01.007