International Journal of Theoretical Physics
International Journal of Theoretical Physics > 2004 > 43 > 3 > 575-583
International Journal of Theoretical Physics > 2004 > 43 > 3 > 563-573
International Journal of Theoretical Physics > 2004 > 43 > 3 > 585-597
International Journal of Theoretical Physics > 2004 > 43 > 10 > 2137-2148