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3. A. N. Skiba, “On one class of local formations of finite groups,” Dokl. Akad. Nauk BSSR,34, No. 11, 982–985 (1990).
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5. V. N. Semenchuk and A. F. Vasil'ev, “Characterizations of local formationsF by given properties of minimal non-F-groups,” in: Studies of the Normal and Subgroup Structure of Finite Groups [in Russian], Nauka i Tekhnika, Minsk (1984).