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Biswas, S.N., Datta, K., Saxena, R.P., Srivastava, P.K. and Varma, V.S. (1973) Journal of Mathematical Physics, 14, 1190-1195.
http://dx.doi.org/10.1063/1.1666462
http://scitation.aip.org/content/aip/journal/jmp/14/9/10.1063/1.1666462
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