@article{ELMA_1987__42_4_141407,
     author = {H.-J. Seiffert},
     title = {Werte zwischen dem geometrischen und dem arithmetischen {Mittel} zweier {Zahlen.}},
     journal = {Elemente der Mathematik},
     pages = {105--107},
     publisher = {mathdoc},
     volume = {42},
     number = {4},
     year = {1987},
     zbl = {0721.26009},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1987__42_4_141407/}
}