Bellin, Albert I.; Messina, D. Richard & Richards, Paul B. Preliminary Study of Stability of Flow From Two Ducts Discharging Into a Common Duct, report, July 1951; (https://digital.library.unt.edu/ark:/67531/metadc61880/m1/1/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .