Shastry, Vidyavati, et al. “Spectroscopic Study on Kinetics of Oxidation of Doxycycline Hydrochloride by N-Chlorosuccinamide in Acidic Medium”. Asian Journal of Chemistry, vol. 29, no. 11, Sept. 2017, pp. 2353-6, doi:10.14233/ajchem.2017.20566.