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. PMID10913872. doi:10.1111/j.1574-6968.2000.tb09212.x.
Brocks J, Logan G, Buick R, Summons R (1999). "Archean molecular fossils and the early rise of eukaryotes". Science285 (5430): 1033–6. PMID10446042. doi:10.1126/science.285.5430.1033.
Fischer, W. W., Summons, R. E., Pearson, A. (2005). "Targeted genomic detection of biosynthetic pathways: anaerobic production of hopanoid biomarkers by a common sedimentary microbe". Geobiology3: 3340. doi:10.1111/j.1472-4669.2005.00041.x.
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. PMID10913872. doi:10.1111/j.1574-6968.2000.tb09212.x.
Brocks J, Logan G, Buick R, Summons R (1999). "Archean molecular fossils and the early rise of eukaryotes". Science285 (5430): 1033–6. PMID10446042. doi:10.1126/science.285.5430.1033.