Formations and π-closure in finite groups
Compositio Mathematica, Tome 23 (1971) no. 3, pp. 347-356. 
@article{CM_1971__23_3_347_0,
     author = {Beidleman, James C.},
     title = {Formations and $\pi $-closure in finite groups},
     journal = {Compositio Mathematica},
     pages = {347--356},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {23},
     number = {3},
     year = {1971},
     zbl = {0228.20009},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1971__23_3_347_0/}
}
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Beidleman, James C. Formations and $\pi $-closure in finite groups. Compositio Mathematica, Tome 23 (1971) no. 3, pp. 347-356. http://archive.numdam.org/item/CM_1971__23_3_347_0/

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