1. A. I. Kostrikin, I. A. Kostrikin, and V. A. Ufnarovskii, "Orthogonal decompositions of simple Lie algebras," Dokl. Akad. Nauk SSSR,260, No. 3, 526–530 (1981).
2. A. I. Kostrikin, I. A. Kostrikin, and V. A. Ufnarovskii, "On decompositions of classical Lie algebras," Trudy Mat. Inst. im. V. A. Steklova,166, 107–122 (1984).
3. J. G. Thompson, "A conjugacy theorem for E8," J. Algebra,38, No. 2, 525–530 (1976).
4. W. H. Hesselink, "Special and pure gradings of Lie algebras," Math. Z.,179, No. 1, 135–149 (1982).
5. D. N. Ivanov, "Orthogonal decompositions of Lie algebras of type and isotropic bundles," Usp. Mat. Nauk,42, No. 4, 187–188 (1987).