@article{1255454114, author = {Kan, Daniel M.}, title = {Minimal free c.s.s. groups}, journal = {Illinois J. Math.}, volume = {2}, number = {1}, year = {1958}, pages = { 537-547}, language = {en}, url = {http://dml.mathdoc.fr/item/1255454114} }
Kan, Daniel M. Minimal free c.s.s. groups. Illinois J. Math., Tome 2 (1958) no. 1, pp. 537-547. http://gdmltest.u-ga.fr/item/1255454114/