@incollection{Walusinski12,
author = {Olivier Walusinski},
title = {Fetal Yawning},
booktitle = {Sonography},
publisher = {IntechOpen},
address = {Rijeka},
year = {2012},
editor = {Kerry Thoirs},
chapter = {18},
doi = {10.5772/28234},
url = {https://doi.org/10.5772/28234}
}