中国科学院数学与系统科学研究院期刊网
Existence and Regularity of Entropy Solutions of Nonlinear Elliptic Boundary Value Problem with Equivalued Surface
Feng Quan LI
Acta Mathematica Sinica, Chinese Series . 2004, (3): 455 -466 .  DOI: 10.12386/A2004sxxb0058