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Results in Mathematics > 2017 > 72 > 4 > 1697-1716
Applied Mathematical Modelling > 2016 > 40 > 2 > 1676-1682
Journal of Zhejiang University-SCIENCE A > 2006 > 7 > 9 > 1544-1549
Results in Mathematics > 2017 > 72 > 4 > 1697-1716
Applied Mathematical Modelling > 2016 > 40 > 2 > 1676-1682
Journal of Zhejiang University-SCIENCE A > 2006 > 7 > 9 > 1544-1549