By Ovsienko Valentin   Tabachnikov Serge   in Bulletin of the London Mathematical Society

ISSN:0024-6093|45|3|625-632

Oxford University Press‎(2013)‎

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By Gargoubi Hichem   Mellouli Najla   Ovsienko Valentin   in Letters in Mathematical Physics

ISSN:0377-9017|79|1|51-65

Springer Publishing Company ‎(2007)‎

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By Ovsienko Valentin   Schwartz Richard   Tabachnikov Serge   in Communications in Mathematical Physics

ISSN:0010-3616|299|2|409-446

Springer Publishing Company ‎(2010)‎

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