Brocks J, Logan G, Buick R, Summons R (1999). «Archean molecular fossils and the early rise of eukaryotes.». Science285 (5430): 1033-6. PMID 10446042.
Poralla K, Muth G, Härtner T (2000). «Hopanoids are formed during transition from substrate to aerial hyphae in Streptomyces coelicolor A3(2).». FEMS Microbiol Lett189 (1): 93-5. PMID 10913872.
Berry A, Harriott O, Moreau R, Osman S, Benson D, Jones A (1993). «Hopanoid lipids compose the Frankia vesicle envelope, presumptive barrier of oxygen diffusion to nitrogenase.». Proc Natl Acad Sci U S A90 (13): 6091-4. PMID 11607408.