Donoughe, Patrick L & Livingood, John N B. Exact solutions of laminar-boundary-layer equations with constant property values for porous wall with variable temperature, report, January 1, 1955; (https://digital.library.unt.edu/ark:/67531/metadc60616/m1/1/: accessed January 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .