1. Enzyme localization in Azobacter vinelandii;ALEXANDER M.;Proc. Natl. Acad. Sci. U. S.,1955
2. Molybdan als Katalysator bei der biologischen Stickstoffbindung;BORTELS H.;Arch. MiCrobiol.,1930
3. The Influence of fixed nitrogen on Azotobacter;BURK D.;J. Bacteriol.,1930
4. Nitrogen fixation by Azotobacter as influenced by molybdenum and vanadium;HORNER C. K.;J. Agr. Research,1942
5. The influence of molybdenum, calcium and agar on nitrogen fixation by Azotobacter indicum;JENSEN H. L.;Proc. Linnean Soc. N. S. Wales,1947