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@article{JRAM_1962__210_150540, author = {Roger C. Lyndon}, title = {Dependence and {Independence} in {Free} {Groups.}}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {148--174}, publisher = {mathdoc}, volume = {210}, year = {1962}, zbl = {0105.01901}, url = {http://geodesic.mathdoc.fr/item/JRAM_1962__210_150540/} }
Roger C. Lyndon. Dependence and Independence in Free Groups.. Journal für die reine und angewandte Mathematik, Tome 210 (1962), pp. 148-174. http://geodesic.mathdoc.fr/item/JRAM_1962__210_150540/