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Theoretical and Mathematical Physics > 2018 > 196 > 1 > 939-956
Iranian Journal of Science and Technology, Transactions A: Science > 2018 > 42 > 2 > 615-621
Demonstratio Mathematica > 2016 > Vol. 49, nr 3 > 331--344
Theoretical and Mathematical Physics > 2018 > 196 > 1 > 939-956
Iranian Journal of Science and Technology, Transactions A: Science > 2018 > 42 > 2 > 615-621
Demonstratio Mathematica > 2016 > Vol. 49, nr 3 > 331--344