Geodesic
Finite solvable groups with nilpotent 2-maximal subgroups
Matematičeskie zametki, Tome 3 (1968) no. 1, pp. 21-32.

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In this article we describe finite solvable groups whose 2-maximal subgroups are nilpotent (a 2-maximal subgroup of a group). Unsolvable groups with this property were described in [2, 3]. 
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     author = {V. A. Belonogov},
     title = {Finite solvable groups with nilpotent 2-maximal subgroups},
     journal = {Matemati\v{c}eskie zametki},
     pages = {21--32},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_3_1_a2/}
}
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V. A. Belonogov. Finite solvable groups with nilpotent 2-maximal subgroups. Matematičeskie zametki, Tome 3 (1968) no. 1, pp. 21-32. http://geodesic.mathdoc.fr/item/MZM_1968_3_1_a2/