Geodesic
Proof of a~generalization of the~conjecture of Hanna Neumann for virtually free groups
Sbornik. Mathematics, Tome 187 (1996) no. 10, pp. 1561-1575

Voir la notice de l'article provenant de la source Math-Net.Ru

The article confirms a generalization of a conjecture of Hanna Neumann for groups having the free product of three groups of order 2 as subgroups of finite index. 
@article{SM_1996_187_10_a7,
     author = {Yu. S. Semenov},
     title = {Proof of a~generalization of the~conjecture of {Hanna} {Neumann} for virtually free groups},
     journal = {Sbornik. Mathematics},
     pages = {1561--1575},
     publisher = {mathdoc},
     volume = {187},
     number = {10},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1996_187_10_a7/}
}
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Yu. S. Semenov. Proof of a~generalization of the~conjecture of Hanna Neumann for virtually free groups. Sbornik. Mathematics, Tome 187 (1996) no. 10, pp. 1561-1575. http://geodesic.mathdoc.fr/item/SM_1996_187_10_a7/