International Journal of Theoretical Physics
International Journal of Theoretical Physics > 2004 > 43 > 2 > 315-321
International Journal of Theoretical Physics > 2004 > 43 > 6 > 1461-1467
International Journal of Theoretical Physics > 2004 > 43 > 2 > 315-321
International Journal of Theoretical Physics > 2004 > 43 > 6 > 1461-1467