中国科学院数学与系统科学研究院期刊网
Comparability and s-Comparability of Modules over Exchange Rings
Huan Yin CHEN(1),Fu An LI(2)
Acta Mathematica Sinica, Chinese Series . 2002, (1): 105 -108 .  DOI: 10.12386/A2002sxxb0013