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International Journal of Theoretical Physics > 2010 > 49 > 9 > 2065-2073
Reports on Mathematical Physics > 2008 > 62 > 2 > 219-227
Physics Letters A > 2007 > 361 > 4-5 > 283-286
International Journal of Theoretical Physics > 2010 > 49 > 9 > 2065-2073
Reports on Mathematical Physics > 2008 > 62 > 2 > 219-227
Physics Letters A > 2007 > 361 > 4-5 > 283-286