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Reports on Mathematical Physics > 2013 > 71 > 2 > 217-229
Open Physics > 2006 > 4 > 3 > 318-330
Open Physics > 2006 > 4 > 3 > 318-330
Open Physics > 2004 > 2 > 3 > 456-466
Open Physics > 2004 > 2 > 3 > 456-466
Reports on Mathematical Physics > 2013 > 71 > 2 > 217-229
Open Physics > 2006 > 4 > 3 > 318-330
Open Physics > 2006 > 4 > 3 > 318-330
Open Physics > 2004 > 2 > 3 > 456-466
Open Physics > 2004 > 2 > 3 > 456-466