Munk, Max M. The Simplifying Assumptions, Reducing the Strict Application of Classical Hydrodynamics to Practical Aeronautical Computations, report, November 1924; (https://digital.library.unt.edu/ark:/67531/metadc53874/m1/1/: accessed May 21, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .