Harm Derksen, Gregor Kemper. (2002), Derkson, Harm; Kemper, Gregor, eds., Computational Invariant Theory, ISBN3540434763, Invariant theory and algebraic transformation groups, Springer-Verlag, p. 49, OCLC49493513.
edited by A.N. Kolmogorov, A.P. Yushkevich ; translated from the Russian by A. Shenitzer, H. Grant and O.B. Sheinin. (2001), Kolmogorov, A. N.; Yushkevich, A. P., eds., Mathematics of the 19th Century: Mathematical Logic, Algebra, Number Theory, Probability Theory, ISBN3764364424, Springer-Verlag, p. 85, OCLC174767718 !CS1 manut: Nomes múltiplos: lista de autores (link).