Fathy, W. M., S. Farag, R., El Nawawy, M., Atiaa, H. and Mahdy, T. (2013) “High Performance Liquid Chromatography Method to Detect Tramadol and Sildenafil in the Blood of Rats on Combination Treatment”., INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY, 11(6), pp. 2682–2690. doi: 10.24297/ijct.v11i6.3043.