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Indian Journal of Pure and Applied Mathematics > 2014 > 45 > 6 > 989-1002
Reports on Mathematical Physics > 2012 > 69 > 2 > 197-212
Indian Journal of Pure and Applied Mathematics > 2014 > 45 > 6 > 989-1002
Reports on Mathematical Physics > 2012 > 69 > 2 > 197-212