Fitzgibbons, D.A. Effect of geometry and surface condensation on the behavior of a torsion effusion cell, thesis or dissertation, August 1, 1974; (https://digital.library.unt.edu/ark:/67531/metadc1020457/m1/1/: accessed April 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .