Hong Li 0007 Li Zhang 0051 Solving Linear Bilevel Programming Problems Using a Binary Differential Evolution. 38-42 2015 CIS https://doi.org/10.1109/CIS.2015.18 https://doi.ieeecomputersociety.org/10.1109/CIS.2015.18 conf/cis/2015 db/conf/cis/cis2015.html#LiZ15