@article{1183529855, author = {Anshel, Michael and Clay, James R.}, title = {Planarity in algebraic systems}, journal = {Bull. Amer. Math. Soc.}, volume = {74}, number = {6}, year = {1968}, pages = { 746-748}, language = {en}, url = {http://dml.mathdoc.fr/item/1183529855} }
Anshel, Michael; Clay, James R. Planarity in algebraic systems. Bull. Amer. Math. Soc., Tome 74 (1968) no. 6, pp. 746-748. http://gdmltest.u-ga.fr/item/1183529855/