3 citations to https://www.mathnet.ru/rus/im1374

1. Dmitri I. Panyushev, “Periodic automorphisms of takiff algebras, contractions, and θ-groups”, Transformation Groups, 14:2 (2009), 463  
2. Panyushev D., “On Invariant Theory of Theta-Groups”, J. Algebra, 283:2 (2005), 655–670        
3. V. L. Popov, E. B. Vinberg, Encyclopaedia of Mathematical Sciences, 55, Algebraic Geometry IV, 1994, 123