Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1970__186_161990, author = {S.J. BERNAU}, title = {Free {Non-abelian} {Lattice} {Groups.}}, journal = {Mathematische Annalen}, pages = {249--262}, publisher = {mathdoc}, volume = {186}, year = {1970}, zbl = {0185.07501}, url = {http://geodesic.mathdoc.fr/item/MAN_1970__186_161990/} }
S.J. BERNAU. Free Non-abelian Lattice Groups.. Mathematische Annalen, Tome 186 (1970), pp. 249-262. http://geodesic.mathdoc.fr/item/MAN_1970__186_161990/