@article{chah_oboegbulem_2007,  title={Extended-spectrum beta-lactamase production among ampicillin-resistant Escherichia coli strains from chicken in Enugu State, Nigeria},  volume={38},  ISSN={1517-8382},  url={https://doi.org/10.1590/S1517-83822007000400018},  DOI={10.1590/S1517-83822007000400018},  number={4},  journal={Brazilian Journal of Microbiology},  publisher={Sociedade Brasileira de Microbiologia},  author={Chah, K.F. and Oboegbulem, S.I.},  year={2007},  month={Oct},  pages={681–686} }