叶庆凯. THE OPTIMAL FEEDBACK CONTROL OF LINEAR SYSTEMS WITH NON-CHEAP CONTROL[J]. 数学物理学报(英文版), 1983, 3(2): 171-182.
Ye Qingkai. THE OPTIMAL FEEDBACK CONTROL OF LINEAR SYSTEMS WITH NON-CHEAP CONTROL[J]. Acta mathematica scientia,Series B, 1983, 3(2): 171-182.