RT Journal T1 Relative torsionless modules A1 XU Hui, ZHAO Zhi-bing PB JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) FD 2017-08-20 YR 2017 JF JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) JO JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) VO 52 IS 8 SP 75 DO 10.6040/j.issn.1671-9352.0.2016.458 K1 #i# ω#/i#-torsionless modules;#i#ω#/i#-reexive modules;(strong)grade of modules related to #i#ω#/i#;extension closure LK {http://lxbwk.njournal.sdu.edu.cn/EN/article/article_2892.shtml}