中国科学院数学与系统科学研究院期刊网
AMS
A Sufficient Condition for a Smash Product as a Transfinite Left Free Normalizing Extension and Its Application
Zhongkui Liu, Zhongkui Liu
Acta Mathematica Sinica . 2000, (1): 71 -78 .  DOI: 10.1007/s101149900026