Rafi O. Zaman Brohi, Muhammad Yar Khuhawar, Azizullah Channa, Abdul Jabbar Laghari, and Kulsoom Abbasi , trans. 2016. “Gas Chromatographic Determination of Purines and Pyrimidines from DNA Using Ethyl Chloroformate As Derivatizing Reagent”. Pakistan Journal of Analytical & Environmental Chemistry 17 (1): 50 – 57. https://doi.org/10.21743/pjaec/2016.06.008.