@article{oliveira_andrade_lemos_brito_pedrosa_silva_2011,  title={Abdominal muscle electrical activity during labor expulsive stage: a cross-sectional study},  volume={15},  ISSN={1413-3555},  url={https://doi.org/10.1590/S1413-35552011005000029},  DOI={10.1590/S1413-35552011005000029},  number={6},  journal={Brazilian Journal of Physical Therapy},  publisher={Associação Brasileira de Pesquisa e Pós-Graduação em Fisioterapia  },  author={Oliveira, Belisa D. R. and Andrade, Armèle Dornelas de and Lemos, Andréa and Brito, Vitor C. and Pedrosa, Manuela L. and Silva, Thayse N. S.},  year={2011},  month={Nov},  pages={445–451} }