1. 1. British pharmacopoeia. The Stationary Office, London, 2001, pp. 526-527.
2. 2. Sreeram V., Nagendrakumar A.V.D., Srinivasa Rao Karumuri, Madhu M. UV assay method for the determination of Doxycycline hyclate in bulk and pharmaceutical formulation. Chemical Science Transactions, 2015, vol. 4, no. 1, pp. 69-74.
3. 3. Kumar A., Nanda S., Chomwal R. Spectrophotometeric methods for determination of doxycycline in Tablet Formulation. International Journal of PharmTech Research, 2010, vol. 2, no. 1, pp. 599-602.
4. 4. Al-Kalissy R.S., Mohammed A.K. Spectrophotometric method for the determination of tetracycline and doxycycline by oxidizing coupling reaction with 4-aminoantipyrine. Ibn Al-Haitham Journal for Pure & Applied Science, 2015, vol. 28, no. 3, pp. 154-168.
5. 5. Zuhair A.A.K., Rana A.R. Visible spectrophotometric analysis for the mutual determination of doxycycline hydrochloride and iron in real samples after cloud point extraction. International Journal of Chemical Science, 2016, vol. 14, no. 2, pp. 955-977.