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Russian Physics Journal > 2018 > 61 > 4 > 635-642
Differential Geometry and its Applications > 2011 > 29 > Supplement 1 > S251-S254
Journal of Geometry and Physics > 2002 > 43 > 2-3 > 93-132
Letters in Mathematical Physics > 2001 > 58 > 3 > 189-204