By Winternitz P.   Dorodnitsyn V.   Kaptsov E.   Kozlov R.   in Doklady Mathematics

ISSN:1064-5624|89|1|106-109

MAIK Nauka/Interperiodica‎(2014)‎

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By Dorodnitsyn V   Kaptsov E   Kozlov R   Winternitz P   in Journal of Physics A: Mathematical and Theoretical

ISSN:1751-8121|48|5|55202-55233

IOP Publishing‎(2015)‎

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