Kaufman, Warner B.; Lezberg, Erwin A. & Breitwieser, Roland. Preliminary evaluation of pentaborane in a 1/4-sector of an experimental annular combustor, report, May 22, 1957; (https://digital.library.unt.edu/ark:/67531/metadc62436/m1/1/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .