宋清芳, 朱大新. A Semigroup Treatment to Viscosity Solutions of the Hanilton-Jacobi Fquation[J]. 数学季刊, 1993, 8(2): 94-101.
Song qingfang, Zhu Daxin. A Semigroup Treatment to Viscosity Solutions of the Hanilton-Jacobi Fquation[J]. Chinese Quarterly Journal of Mathematics, 1993, 8(2): 94-101.