TY - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) A1 - ZHANG Hai-yang, MA Zhou-ming, YU Pei-qiu, LIN Meng-lei, LI Jin-jin T1 - Incremental method for approximating sets of multi-granularity rough sets Y1 - JF - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) JO - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) SP - 51 EP - 61 VL - 55 IS - 1 UR - http://lxbwk.njournal.sdu.edu.cn N1 - 10.6040/j.issn.1671-9352.1.2019.167 ER -