International Journal of Theoretical Physics
International Journal of Theoretical Physics > 2019 > 58 > 3 > 817-823
International Journal of Theoretical Physics > 2019 > 58 > 4 > 1237-1248
International Journal of Theoretical Physics > 2019 > 58 > 4 > 1108-1116
International Journal of Theoretical Physics > 2019 > 58 > 7 > 2346-2356