Ali, M. A., N. Abbas, A. Abbas, and N. Zahra. “Analysis of Thermal Stresses Induced in Radiant Tubes for Heat Exchanger Applications Using Finite Element Method”. The Nucleus, vol. 55, no. 3, Nov. 2018, pp. 133-8, http://thenucleuspak.org.pk/index.php/Nucleus/article/view/432.