Geodesic
On characteristic subgroups of free groups
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 29 (1974) no. 1 
A. Yu. Ol'shanskii. On characteristic subgroups of free groups. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 29 (1974) no. 1. http://geodesic.mathdoc.fr/item/RM_1974_29_1_a20/
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     title = {On characteristic subgroups of free groups},
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[1] B. H. Neumann, “Ascending verbal and Frattini series”, Math. Z., 69:2 (1958), 164–172 | DOI | MR | Zbl

[2] B. H. Neumann, “On characteristic subgroups of free groups”, Math. Z., 94:2 (1966), 143–151 | DOI | MR | Zbl

[3] B. H. Neumann, H. Neumann, “Zwei Klassen characteristischer Untergruppen und ihre Faktorgruppen”, Math. Nachr., 4 (1950/51), 106–125 | MR

[4] D. E. Cohen, “Characteristic subgroups of some relatively free groups”, J. London Math. Soc., 43:3 (1968), 445–451 | DOI | MR | Zbl

[5] Kh. Neiman, Mnogoobraziya grupp, «Mir», M., 1969 | MR