@article{1256067582, author = {Koehler, John E.}, title = {The type set of a torsion-free group of finite rank}, journal = {Illinois J. Math.}, volume = {9}, number = {4}, year = {1965}, pages = { 66-86}, language = {en}, url = {http://dml.mathdoc.fr/item/1256067582} }
Koehler, John E. The type set of a torsion-free group of finite rank. Illinois J. Math., Tome 9 (1965) no. 4, pp. 66-86. http://gdmltest.u-ga.fr/item/1256067582/