@article{1183511149,
author = {Breusch, Robert},
title = {On the sum of the relative extrema of $\left| {f\left( z \right)} \right|$ on the unit circle},
journal = {Bull. Amer. Math. Soc.},
volume = {53},
number = {12},
year = {1947},
pages = { 982-986},
language = {en},
url = {http://dml.mathdoc.fr/item/1183511149}
}
Breusch, Robert. On the sum of the relative extrema of $\left| {f\left( z \right)} \right|$ on the unit circle. Bull. Amer. Math. Soc., Tome 53 (1947) no. 12, pp. 982-986. http://gdmltest.u-ga.fr/item/1183511149/