RT Journal T1 Interval algorithm for mixed integer nonlinear two-level programming problems A1 PB JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) FD 2018-02-20 YR 2018 JF JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) JO JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) VO 53 IS 2 SP 9 DO 10.6040/j.issn.1671-9352.0.2017.135 K1 nonlinear two-level programming;integer programming;interval algorithm;penalty function LK {http://lxbwk.njournal.sdu.edu.cn/EN/article/article_2737.shtml}