中国科学院数学与系统科学研究院期刊网
AMS
An Infinite Horizon Linear Quadratic Problem with Unbounded Controls in Hilbert Space
Han Zhong WU, Xun Jing LI
Acta Mathematica Sinica . 2001, (3): 527 -540 .  DOI: 10.1007/s101140100123