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Applied Mathematical Modelling > 2016 > 40 > 2 > 1676-1682
Annals of Global Analysis and Geometry > 2003 > 24 > 3 > 261-267
Applied Mathematical Modelling > 2016 > 40 > 2 > 1676-1682
Annals of Global Analysis and Geometry > 2003 > 24 > 3 > 261-267