TY - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) A1 - CHEN Xiu-li, CHEN Jian-long T1 - Copure projective dimensions under Hopf extensions Y1 - 2014-10-20 JF - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) JO - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) SP - 7 EP - 10 VL - 49 IS - 10 UR - http://lxbwk.njournal.sdu.edu.cn N1 - 10.6040/j.issn.1671-9352.0.2014.332 ER -