2 citations to https://www.mathnet.ru/rus/vvgum253

1. Daniel J. F. Fox, “Harmonic cubic homogeneous polynomials such that the norm-squared of the Hessian is a multiple of the Euclidean quadratic form”, Anal.Math.Phys., 11:1 (2021)  
2. Tom De Medts, Simon F. Peacock, Sergey Shpectorov, Michiel Van Couwenberghe, “Decomposition algebras and axial algebras”, Journal of Algebra, 556 (2020), 287