@article{1102971947, author = {Johnson, Norman L.}, title = {Derivable semi-translation planes.}, journal = {Pacific J. Math.}, volume = {35}, number = {3}, year = {1970}, pages = { 687-707}, language = {en}, url = {http://dml.mathdoc.fr/item/1102971947} }
Johnson, Norman L. Derivable semi-translation planes.. Pacific J. Math., Tome 35 (1970) no. 3, pp. 687-707. http://gdmltest.u-ga.fr/item/1102971947/