TY - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) A1 - HAO Xiu-mei, LIU Ji-qin T1 - Cut sets of outer P-fuzzy sets and extended rough sets models Y1 - 2020-10-20 JF - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) JO - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) SP - 1 EP - 6 VL - 55 IS - 10 UR - http://lxbwk.njournal.sdu.edu.cn N1 - 10.6040/j.issn.1671-9352.0.2020.196 ER -