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Ruo Li and Wei Zhong

Numer. Math. Theor. Meth. Appl., doi:10.4208/nmtma.OA-2021-0074
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Jiang Yang and Quanhui Zhu

Numer. Math. Theor. Meth. Appl., doi:10.4208/nmtma.OA-2021-0035
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Guanrong Li, Yanping Chen and Yunqing Huang

Numer. Math. Theor. Meth. Appl., doi:10.4208/nmtma.OA-2020-0165
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