Elmanfe, G. et al. 2020. Determination of Nicotine in Libyan Smokers and Nonsmokers’ Urine Samples by Ultraviolet-Visible Spectrophotometry. Journal of Pure & Applied Sciences . 19, 5 (Oct. 2020), 126–131. DOI:https://doi.org/10.51984/jopas.v19i5.826.