Team, S. (2009). Exact Solutions of Steady Plane Flows of an Incompressible Fluid of Variable Viscosity in The Presence of Unknown External Force Using ($\varepsilon,\psi$ )– or ($\eta,\psi$)-Coordinates: Rana Khalid Naeem, Asif Mansoor, Waseem Ahmed Khan. Thai Journal of Mathematics, 7(2), 259–284. Retrieved from https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/160