@article{GDZPPN002194678, title = {Cofinalities of doubly transitive sets.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, volume = {302}, year = {1978}, pages = {7-15}, zbl = {0368.06001}, url = {http://dml.mathdoc.fr/item/GDZPPN002194678} }
Hickman, J.L. Cofinalities of doubly transitive sets.. Journal für die reine und angewandte Mathematik, Tome 302 (1978) pp. 7-15. http://gdmltest.u-ga.fr/item/GDZPPN002194678/