International Journal of Theoretical Physics
International Journal of Theoretical Physics > 2019 > 58 > 3 > 992-1000
International Journal of Theoretical Physics > 2019 > 58 > 6 > 1882-1891
International Journal of Theoretical Physics > 2019 > 58 > 3 > 992-1000
International Journal of Theoretical Physics > 2019 > 58 > 6 > 1882-1891