中国科学院数学与系统科学研究院期刊网
A Necessary and Sufficient Condition for Feasible Solutions of Multilevel Linear Programming Problems and a Simplex Algorithm
Ruan Guozhen;Yang Fengmei;Wang Shouyang
Systems Engineering - Theory & Practice . 1996, (11): 1 -8 .  DOI: 10.12011/1000-6788(1996)11-1