TY - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) A1 - WANG Xi, SHEN Lei, LUO Xiao-qiang T1 - (m,n)-Cotorson modules and (m,n)-flat modules Y1 - JF - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) JO - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) SP - 10 EP - 17 VL - 56 IS - 1 UR - http://lxbwk.njournal.sdu.edu.cn N1 - 10.6040/j.issn.1671-9352.0.2020.429 ER -