@article{MOMA_1983__95_178114,
     author = {Peter Volkmann and Raymond M. Redheffer},
     title = {\"Uber eine {Ungleichung} von {Schur.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {137--148},
     publisher = {mathdoc},
     volume = {95},
     year = {1983},
     zbl = {0499.15008},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1983__95_178114/}
}