Boyars’kyiO. M., and SkrypnikT. V. “Degenerate Orbits of Adjoint Representation of Orthogonal and Unitary Groups Regarded As Algebraic Submanifolds”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 49, no. 7, July 1997, pp. 895–905, https://umj.imath.kiev.ua/index.php/umj/article/view/5079.