中国科学院数学与系统科学研究院期刊网
AMS
Uniformly Contrastive Semigroups and Submarkovian Semigroups(I)
Yan Shaozong, Zhang Yinnan
Acta Mathematica Sinica . 1991, (3): 252 -258 .  DOI: 10.1007/BF02583002