@incollection{Zollner11,
author = {Ursula Zollner},
title = {Hormonal Diagnosis of Menstrual Irregularities or Secondary Amenorrhoea},
booktitle = {Amenorrhea},
publisher = {IntechOpen},
address = {Rijeka},
year = {2011},
editor = {Amar Chatterjee},
chapter = {1},
doi = {10.5772/26768},
url = {https://doi.org/10.5772/26768}
}