International Journal of Theoretical Physics
International Journal of Theoretical Physics > 2019 > 58 > 2 > 399-402
International Journal of Theoretical Physics > 2019 > 58 > 5 > 1576-1589
International Journal of Theoretical Physics > 2019 > 58 > 8 > 2488-2496
International Journal of Theoretical Physics > 2019 > 58 > 11 > 3815-3821