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Статья

Ga-actions on affine cones

Transformation Groups. 2013. Vol. 18. No. 4. P. 1137-1153.
Kishimoto T., Yuri Prokhorov, Zaidenberg M.

We give a criterion of existence of a unipotent group action on the affine cone over a projective variety or, more generally, on the affine quasicone over a variety which is projective over another affine variety.