Chenggen Shi Hong Zhou Jie Lu Guangquan Zhang Zhongwei Zhang The Kth-best approach for linear bilevel multifollower programming with partial shared variables among followers. 1686-1698 2007 188 Applied Mathematics and Computation 2 http://dx.doi.org/10.1016/j.amc.2006.11.176 db/journals/amc/amc188.html#ShiZLZZ07