TY - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) A1 - LAN Kai-yang, YANG Ting-ting T1 - Some characterizations of a class of special morphisms of modules Y1 - JF - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) JO - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) SP - 54 EP - 58 VL - 55 IS - 8 UR - http://lxbwk.njournal.sdu.edu.cn N1 - 10.6040/j.issn.1671-9352.0.2019.692 ER -