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, July 15, 1954; (https://digital.library.unt.edu/ark:/67531/metadc60616/m1/1/: accessed April 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .