Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MZ_1972__125_171705, author = {Norman L. Johnson}, title = {Homomorphisms of {Free} {Planes.}}, journal = {Mathematische Zeitschrift}, pages = {255--263}, publisher = {mathdoc}, volume = {125}, year = {1972}, zbl = {0234.50016}, url = {http://geodesic.mathdoc.fr/item/MZ_1972__125_171705/} }
Norman L. Johnson. Homomorphisms of Free Planes.. Mathematische Zeitschrift, Tome 125 (1972), pp. 255-263. http://geodesic.mathdoc.fr/item/MZ_1972__125_171705/