By Avramidi Ivan G.   in Mathematical Physics, Analysis and Geometry

ISSN:1385-0172|7|1|9-46

Springer Publishing Company ‎(2004)‎

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By Avramidi Ivan G.   Fucci Guglielmo   in Canadian Journal of Physics

ISSN:1208-6045|87|10|1089-1093

NRC Research Press‎(2009)‎

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