T. M. Hantash, E. A. Abu-Basha, D. A. Roussan, and A. M. Abudabos, “Pharmacokinetics and Bioequivalence of Doxycycline (Providox® and Doxyvet 0-50 S®) Oral Powder Formulations in Chickens”, Int. J. Poult. Sci., vol. 7, no. 2, pp. 161–164, Jan. 2008, doi: 10.3923/ijps.2008.161.164.