Geodesic
The minimal radical and weakly irreducible groups
Matematičeskie zametki, Tome 13 (1973) no. 3, pp. 447-456.

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Under certain restrictions on a class of groups $\mathfrak M$, closed with respect to epimorphisms, we prove the theorem: a nonunit group contains no accessible $\mathfrak M$-subgroups except the unit group if and only if it is approximated by weakly irreducible (after Birkhoff) groups which contain no nonunit accessible $\mathfrak M$-subgroups. 
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     author = {K. K. Shchukin},
     title = {The minimal radical and weakly irreducible groups},
     journal = {Matemati\v{c}eskie zametki},
     pages = {447--456},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_13_3_a15/}
}
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K. K. Shchukin. The minimal radical and weakly irreducible groups. Matematičeskie zametki, Tome 13 (1973) no. 3, pp. 447-456. http://geodesic.mathdoc.fr/item/MZM_1973_13_3_a15/