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Vilcheze, C., Llopiz, P., Neunlist, S., Poralla, K., & Rohmer, M. (1994). Prokaryotic triterpenoids: new hopanoids from the nitrogen-fixing bacteria Azotobacter vinelandii, Beijerinckia indica and Beijerinckia mobilis. Microbiology, 140(10), 2749–2753. doi:10.1099/00221287-140-10-2749 
10.1099/00221287-140-10-2749