Alwan, Samar S, and Intisar J Ismail. “Retentive Forces, Tensile Strength and Deflection Fatigue of Acetal Thermoplastic Clasp Material in Comparison With Cobalt-Chromium Alloy”. Journal of Baghdad College of Dentistry, vol. 26, no. 1, Mar. 2014, pp. 59-66, https://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/298.