Azomonas insignis (Derx 1951) Jensen 1955 (Approved Lists 1980) De Smedt J. Bauwens M. Tytgat R. De Ley J. Intra- and intergeneric similarities of ribosomal ribonucleic acid cistrons of free-living, nitrogen-fixing bacteria. 1980 30 1 106 122 International Journal of Systematic Bacteriology Int J Syst Bacteriol 0020-7713 10.1099/00207713-30-1-106