Berkovich, Yakov and Janko, Zvonimir. "§34. Nilpotent groups of automorphisms". Volume 1, Berlin, New York: De Gruyter, 2008, pp. 318-325. https://doi.org/10.1515/9783110208221.318
Berkovich, Y. & Janko, Z. (2008). §34. Nilpotent groups of automorphisms. In Volume 1 (pp. 318-325). Berlin, New York: De Gruyter. https://doi.org/10.1515/9783110208221.318
Berkovich, Y. and Janko, Z. 2008. §34. Nilpotent groups of automorphisms. Volume 1. Berlin, New York: De Gruyter, pp. 318-325. https://doi.org/10.1515/9783110208221.318
Berkovich, Yakov and Janko, Zvonimir. "§34. Nilpotent groups of automorphisms" In Volume 1, 318-325. Berlin, New York: De Gruyter, 2008. https://doi.org/10.1515/9783110208221.318
Berkovich Y, Janko Z. §34. Nilpotent groups of automorphisms. In: Volume 1. Berlin, New York: De Gruyter; 2008. p.318-325. https://doi.org/10.1515/9783110208221.318