A penalty function method based on smoothing lower order penalty function. - Xinsheng Xu; Zhiqing Meng; Jianwu Sun; Rui Shen 001 (J. Comput. Appl. Math., 2011)

A second-order smooth penalty function algorithm for constrained optimization problems. - Xinsheng Xu; Zhiqing Meng; Jianwu Sun; LiGuo Huang; Rui Shen 001 (Comput. Optim. Appl., 2013)