Ochs M, Nyengaard JR, Jung A, Knudsen L, Voigt M, Wahlers T, et al. (January 2004). "The number of alveoli in the human lung". American Journal of Respiratory and Critical Care Medicine. 169 (1): 120–124. doi:10.1164/rccm.200308-1107OC. PMID14512270.
Ochs M, Nyengaard JR, Jung A, Knudsen L, Voigt M, Wahlers T, et al. (January 2004). "The number of alveoli in the human lung". American Journal of Respiratory and Critical Care Medicine. 169 (1): 120–124. doi:10.1164/rccm.200308-1107OC. PMID14512270.