International Journal of Theoretical Physics
International Journal of Theoretical Physics > 2013 > 52 > 1 > 212-218
International Journal of Theoretical Physics > 2013 > 52 > 1 > 156-162
International Journal of Theoretical Physics > 2013 > 52 > 1 > 212-218
International Journal of Theoretical Physics > 2013 > 52 > 1 > 156-162