We consider integrable system on the sphere $S^2$ with an additional integral
of fourth order in the momenta. At the special values of parameters this system
coincides with the Kowalevski-Goryachev-Chaplygin system.Comment: LaTeX, 6 page

A V Tsiganov

Bogoyavlensky O I

Bolsinov A V

Chaplygin S A

Darboux G

Goryachev D N

Kolokol'tzov V N

Komarov I V

Kowalevski S

Kuznetsov V B

Novikov S P

Sklyanin E K

Tsiganov A V

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English

On integrable system on $S^2$ with the second integral quartic in the
  momenta