Geodesic
On word subgroups of free groups
Matematika, Tome 12 (1968) no. 4, pp. 25-41 
P. M. Neumann. On word subgroups of free groups. Matematika, Tome 12 (1968) no. 4, pp. 25-41. http://geodesic.mathdoc.fr/item/MAT_1968_12_4_a2/
@article{MAT_1968_12_4_a2,
     author = {P. M. Neumann},
     title = {On word subgroups of free groups},
     journal = {Matematika},
     pages = {25--41},
     year = {1968},
     volume = {12},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1968_12_4_a2/}
}
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