The Possibility of Branch Conformation in Azotobacter Vinelandii Chromosomal DNA Carrying Multiple Gene Copies and Its Folded State in the Cell, thesis or dissertation, August 1991; (https://digital.library.unt.edu/ark:/67531/metadc798271/m1/70/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .