Kuznetsov, I., H. Naumenko, N. Reznichenko, A. Kostiuk, R. Savyak, and D. Oleynikov. “Development and Validation of Method for Quantitative Determination of Sildenafil and N-Desmethyl Sildenafil by HPLC-MS/MS in Human Blood Plasma”. ScienceRise: Pharmaceutical Science, no. 1 (5), Feb. 2017, pp. 22-32, doi:10.15587/2519-4852.2017.92823.