@article{GDZPPN00203705X, title = {An extremal problem related to probability.}, journal = {Aequationes mathematicae}, volume = {33}, year = {1987}, pages = {316-324}, zbl = {0632.60074}, url = {http://dml.mathdoc.fr/item/GDZPPN00203705X} }
Rätz, Jürg; Russell, Dennis. An extremal problem related to probability.. Aequationes mathematicae, Tome 33 (1987) pp. 316-324. http://gdmltest.u-ga.fr/item/GDZPPN00203705X/