Gribovskaya EE, Monakhov VS, Sel’kin VM. On Solvable Normal Subgroups of Finite Groups. Ukr. Mat. Zhurn. [Internet]. 2002Jul.25 [cited 2024May19];54(7):950-6. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4131