中国科学院数学与系统科学研究院期刊网
AMS
On Finite Groups with Some Semi Cover-Avoiding Subgroups
Xiu Yun GUO, Li Li WANG
Acta Mathematica Sinica . 2007, (9): 1689 -1696 .  DOI: 10.1007/s10114-007-0946-4