Siddiqi, N. J., E. A. Al omireeni, and A. S. Alhomida. “Effect of Different Doses of Sodium Fluoride on Various Hydroxyproline Fractions in Rat Serum”. Cellular and Molecular Biology, vol. 57, no. 1, Feb. 2011, pp. 93-99, http://cellmolbiol.org/index.php/CMB/article/view/961.