Seppo Rickman, “Quasiregular mappings and metrics on then-sphere with punctures”, Comment Math Helv, 59:1 (1984), 136
Victor G Kač, Dale H Peterson, “Infinite-dimensional Lie algebras, theta functions and modular forms”, Advances in Mathematics, 53:2 (1984), 125
George Maxwell, “Sphere packings and hyperbolic reflection groups”, Journal of Algebra, 79:1 (1982), 78
V. G. Kac, “Infinite root systems, representations of graphs and invariant theory”, Invent math, 56:1 (1980), 57
В. В. Никулин, “Об арифметических группах, порожденных отражениями, в пространствах Лобачевского”, Изв. АН СССР. Сер. матем., 44:3 (1980), 637–669 ; V. V. Nikulin, “On arithmetic groups generated by reflections in Lobachevskii spaces”, Math. USSR-Izv., 16:3 (1981), 573–601
Dieter Happel, Udo Preiser, Claus Michael Ringel, Lecture Notes in Mathematics, 832, Representation Theory II, 1980, 280
V.G Kac, “Infinite-dimensional algebras, Dedekind's η-function, classical möbius function and the very strange formula”, Advances in Mathematics, 30:2 (1978), 85
Э. Б. Винберг, “Об унимодулярных целочисленных квадратичных формах”, Функц. анализ и его прил., 6:2 (1972), 24–31 ; È. B. Vinberg, “On unimodular integral quadratic forms”, Funct. Anal. Appl., 6:2 (1972), 105–111