@article{Bentzen_2016,
title={Airflow in Gravity Sewers – Determination of Wastewater Drag Coefficient},
volume={88},
ISSN={1554-7531},
url={http://dx.doi.org/10.2175/106143016x14504669767698},
DOI={10.2175/106143016x14504669767698},
number={3},
journal={Water Environment Research},
publisher={Wiley},
author={Bentzen,
Thomas Ruby and Østertoft,
Kristian Kilsgaard and Vollertsen,
Jes and Fuglsang,
Emil Dietz and Nielsen,
Asbjørn Haaning},
year={2016},
month=mar,
pages={239–256} }