@article{el-tantawy_temraz_el-gindi_2007,  title={Free serum testosterone level in male rats treated with tribulus alatus extracts},  volume={33},  ISSN={1677-5538},  url={https://doi.org/10.1590/S1677-55382007000400015},  DOI={10.1590/S1677-55382007000400015},  number={4},  journal={International braz j urol},  publisher={Sociedade Brasileira de Urologia},  author={El-Tantawy, Walid H. and Temraz, Abeer and El-Gindi, Omayma D.},  year={2007},  month={Jul},  pages={554–559} }