International Journal of Theoretical Physics
International Journal of Theoretical Physics > 2010 > 49 > 4 > 777-785
International Journal of Theoretical Physics > 2010 > 49 > 11 > 2723-2733
International Journal of Theoretical Physics > 2010 > 49 > 4 > 777-785
International Journal of Theoretical Physics > 2010 > 49 > 11 > 2723-2733