Guarner F, Malagelada JR (February 2003). "Gut flora in health and disease". Lancet 361 (9356): 512–9. doi:10.1016/S0140-6736(03)12489-0.PMID 12583961.
[^ Junjie Qin; et al (2009). "A human gut microbial gene catalogue established by metagenomic sequencing". Nature 464 (7285): 59–65. doi:10.1038/nature08821. PMID 20203603. Retrieved 2010-03-06]
Schwiertz A, Gruhl B, Löbnitz M, Michel P, Radke M, Blaut M (September 2003). "Development of the intestinal bacterial composition in hospitalized preterm infants in comparison with breast-fed, full-term infants". Pediatr. Res. 54 (3): 393–9. doi:10.1203/01.PDR.0000078274.74607.7A.PMID 12788986
Coppa GV, Bruni S, Morelli L, Soldi S, Gabrielli O (July 2004). "The first prebiotics in humans: human milk oligosaccharides". J. Clin. Gastroenterol. 38 (6 Suppl): S80–3.doi:10.1097/01.mcg.0000128926.14285.25. PMID 15220665
Harmsen HJ, Wildeboer-Veloo AC, Raangs GC, et al. (January 2000). "Analysis of intestinal flora development in breast-fed and formula-fed infants by using molecular identification and detection methods". J. Pediatr. Gastroenterol. Nutr. 30 (1): 61–7. doi:10.1097/00005176-200001000-00019.PMID 10630441
Fredrik Bäckhed, Hao Ding, Ting Wang, Lora V. Hooper, Gou Young Koh, Andras Nagy, Clay F. Semenkovich and Jeffrey I. Gordon. The gut microbiota as an environmental factor that regulates fat storage. Procedings of the National Academy of Sciences of the United States of America, vol.101, n°44, 2/11/2004 [1]