中国科学院数学与系统科学研究院期刊网
An Infinite Horizon Linear Quadratic Problem with Unbounded Controls in Hilbert Space
Han Zhong WU,Xun Jing LI
Acta Mathematica Sinica, Chinese Series . 2003, (4): 721 -728 .  DOI: 10.12386/A2003sxxb0096