Trofimuk, A. A., & Gritsuk , D. V. (2020). The derived $p$-length of a $p$-solvable group with bounded indices of Fitting $p$-subgroups in its normal closures. Ukrains’kyi Matematychnyi Zhurnal, 72(3), 366-370. https://doi.org/10.37863/umzh.v72i3.629