@article{JRAM_1968__230_150847,
     author = {A.M. Ostrowski},
     title = {On the moduli of zeros of derivatives of polynomials.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {40--50},
     publisher = {mathdoc},
     volume = {230},
     year = {1968},
     zbl = {0159.09903},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1968__230_150847/}
}