Roper, T.J.; et al. (2001). "Environmental conditions in burrows of two species of African mole-rat, Georychus capensis and Cryptomys damarensis". Journal of Zoology254 (1): 101–107. doi:10.1017/S0952836901000590.
Lindahl, O.; Hart, R.; Hernroth, B.; Kollberg, S.; Loo, L. O.; Olrog, L.; Rehnstam-Holm, A. S.; Svensson, J.; Svensson, S.; Syversen, U. (2005). "Improving marine water quality by mussel farming: A profitable solution for Swedish society". Ambio34 (2): 131–138. PMID15865310. doi:10.1579/0044-7447-34.2.131.
Lindahl, O.; Hart, R.; Hernroth, B.; Kollberg, S.; Loo, L. O.; Olrog, L.; Rehnstam-Holm, A. S.; Svensson, J.; Svensson, S.; Syversen, U. (2005). "Improving marine water quality by mussel farming: A profitable solution for Swedish society". Ambio34 (2): 131–138. PMID15865310. doi:10.1579/0044-7447-34.2.131.
noaa.gov
oceanservice.noaa.gov
Rabalais, Nancy; Turner, R. Eugene; Justic´, Dubravko; Dortch, Quay; Wiseman, William J. Jr. Characterization of Hypoxia: Topic 1 Report for the Integrated Assessment on Hypoxia in the Gulf of Mexico. Ch. 3. NOAA Coastal Ocean Program, Decision Analysis Series No. 15. May 1999. < http://oceanservice.noaa.gov/products/hypox_t1final.pdf>. Retrieved February 11, 2009.