@article{GDZPPN002419106, title = {On Ternary Rings of Derivable Planes.}, journal = {Mathematische Zeitschrift}, volume = {154}, year = {1977}, pages = {157-158}, zbl = {0363.50014}, url = {http://dml.mathdoc.fr/item/GDZPPN002419106} }
Cofman, Judita. On Ternary Rings of Derivable Planes.. Mathematische Zeitschrift, Tome 154 (1977) pp. 157-158. http://gdmltest.u-ga.fr/item/GDZPPN002419106/