“Invariant Solution of Viscoelastic Fluid Flow in Channels Without Porous Media Attached With Constitutive Model of Oldroyd–B Resolved By Symmetry Method”. Sindh University Research Journal - SURJ (Science Series), vol. 49, no. 1, Jan. 2021, https://sujo.usindh.edu.pk/index.php/SURJ/article/view/2956.