@article{CMH_1937__10_138699,
     author = {Alexander Ostrowski},
     title = {\"Uber die {Absolutabweichung} einer differentiierbaren {Funktion} von ihrem {Integralmittelwert.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {226--227},
     publisher = {mathdoc},
     volume = {10},
     year = {1937},
     zbl = {64.0209.01},
     url = {http://geodesic.mathdoc.fr/item/CMH_1937__10_138699/}
}