@article{DMSMF_1999_1999_1_a9,
     author = {Zalesskii, P. A.},
     title = {Virtually free pro-p groups.},
     journal = {Disertaciones del Seminario de Matem\'aticas Fundamentales},
     pages = {1-6},
     publisher = {mathdoc},
     volume = {18},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMSMF_1999_1999_1_a9/}
}