TY - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) A1 - WANG Jing-jing, LU Yan-qiong T1 - Existence of optimal positive solutions for Neumann boundary value problems of second order differential equations Y1 - JF - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) JO - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) SP - 113 EP - 120 VL - 55 IS - 3 UR - http://lxbwk.njournal.sdu.edu.cn N1 - 10.6040/j.issn.1671-9352.0.2019.208 ER -