Free-flight investigation at transonic speeds of the power-on characteristics including some effects of sonic propulsive jets of a four-engine delta-wing configuration, report, August 16, 1957; (https://digital.library.unt.edu/ark:/67531/metadc63486/m1/4/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .