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We prove that in the Ryabov paper an application of the geometric Kharlamovmethod to the Goryachev system yields noncommutative "new variables ofseparation" instead of the standard canonical variables of separation.

Comment on "The separation of variables and bifurcations of first  integrals in one problem of D.N.Goryachev" by Pavel E. Ryabov  (Archive:1102.2588v1)