Mustafa Gülfen and Yazgı Canbaz , Trans., “Ratio - First Order Derivative - Zero Crossing UV-Visible Spectrophotometric Method for Analysis of Amoxicillin, Levofloxacin and Lansoprazole Mixture”, Pak. J. Anal. Environ. Chem., vol. 21, no. 1, pp. 34 – 43, Jun. 2020, doi: 10.21743/pjaec/2020.06.05.