@article{MZ_1964__83_170234,
     author = {J.C.E. Dekker},
     title = {The minimum of two regressive isols.},
     journal = {Mathematische Zeitschrift},
     pages = {345--366},
     year = {1964},
     volume = {83},
     zbl = {0122.01002},
     url = {http://geodesic.mathdoc.fr/item/MZ_1964__83_170234/}
}