Sawada H, Kuykendall LD, Young JM (2003). «Changing concepts in the systematics of bacterial nitrogen-fixing legume symbionts». J. Gen. Appl. Microbiol. 49 (3): 155–79. PMID12949698. doi:10.2323/jgam.49.155
Sawada H, Kuykendall LD, Young JM (2003). «Changing concepts in the systematics of bacterial nitrogen-fixing legume symbionts». J. Gen. Appl. Microbiol. 49 (3): 155–79. PMID12949698. doi:10.2323/jgam.49.155