Abdul Khafoor, Mayada Q, et al. “Evaluation of Tissue Displacement in Posterior Palatal Seal Area With Different Impression Techniques With Varying Palatal Forms”. Journal of Baghdad College of Dentistry, vol. 25, no. 4, Dec. 2013, pp. 17-25, https://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/163.