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International Journal of Theoretical Physics > 2013 > 52 > 1 > 84-87
International Journal of Theoretical Physics > 2013 > 52 > 12 > 4293-4297
International Journal of Theoretical Physics > 2013 > 52 > 10 > 3658-3661
International Journal of Theoretical Physics > 2012 > 51 > 9 > 2950-2953
Physics Letters A > 2010 > 374 > 22 > 2235-2242