Rehabilitation of hypoxemic patients with COPD at low altitude at the Dead Sea, the lowest place on earth. pubmed.ncbi.nlm.nih.gov [online]. [cit. 2024-11-01]. Dostupné online.
University of Washington. Early Earth's air weighed less than half of today's atmosphere. phys.org [online]. 2016-05-09 [cit. 2023-01-04]. Dostupné online. (anglicky)