@article{AM2_1987__34_137249,
     author = {J\"urg R\"atz and Dennis Russell},
     title = {An extremal problem related to probability.},
     journal = {Aequationes mathematicae},
     pages = {316--324},
     publisher = {mathdoc},
     volume = {34},
     year = {1987},
     zbl = {0632.60074},
     url = {http://geodesic.mathdoc.fr/item/AM2_1987__34_137249/}
}