Portable oxygen concentrator (English Wikipedia)

Sircar, Shivaji (2002). "Pressure Swing Adsorption". Ind. Eng. Chem. Res. 41 (6): 1389–92. doi:10.1021/ie0109758.
Stoller, J.K.; Panos, R.J.; Krachman, S.; Doherty, D.E.; Make, B. (July 2010). "Oxygen therapy for patients with COPD: current evidence and the long-term oxygen treatment trial". Chest. 138 (1): 179–87. doi:10.1378/chest.09-2555. PMC 2897694. PMID 20605816.
"Continuous or nocturnal oxygen therapy in hypoxemic chronic obstructive lung disease: a clinical trial. Nocturnal Oxygen Therapy Trial Group". Annals of Internal Medicine. 93 (3): 391–98. September 1980. doi:10.7326/0003-4819-93-3-391. PMID 6776858.
Emtner, M.; Porszasz, J.; Burns, M.; Somfay, A.; Casaburi, R. (1 November 2003). "Benefits of supplemental oxygen in exercise training in nonhypoxemic chronic obstructive pulmonary disease patients". American Journal of Respiratory and Critical Care Medicine. 168 (9): 1034–42. doi:10.1164/rccm.200212-1525OC. PMID 12869359.

faa.gov

Thomas, Jennifer (23 May 2003). "Oxygen Bars Not a Breath of Fresh Air". Health Day. Retrieved 26 April 2018.

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Jindal, S.K. (2008). "Oxygen Therapy: Important Considerations" (PDF). Indian J Chest Dis Allied Sci. 50 (1): 97–107. ISSN 0377-9343. OCLC 02594075. PMID 18610694. Archived from the original (PDF) on 12 July 2020. Retrieved 26 April 2018.

Jindal, S.K. (2008). "Oxygen Therapy: Important Considerations" (PDF). Indian J Chest Dis Allied Sci. 50 (1): 97–107. ISSN 0377-9343. OCLC 02594075. PMID 18610694. Archived from the original (PDF) on 12 July 2020. Retrieved 26 April 2018.
Stoller, J.K.; Panos, R.J.; Krachman, S.; Doherty, D.E.; Make, B. (July 2010). "Oxygen therapy for patients with COPD: current evidence and the long-term oxygen treatment trial". Chest. 138 (1): 179–87. doi:10.1378/chest.09-2555. PMC 2897694. PMID 20605816.
"Continuous or nocturnal oxygen therapy in hypoxemic chronic obstructive lung disease: a clinical trial. Nocturnal Oxygen Therapy Trial Group". Annals of Internal Medicine. 93 (3): 391–98. September 1980. doi:10.7326/0003-4819-93-3-391. PMID 6776858.
Emtner, M.; Porszasz, J.; Burns, M.; Somfay, A.; Casaburi, R. (1 November 2003). "Benefits of supplemental oxygen in exercise training in nonhypoxemic chronic obstructive pulmonary disease patients". American Journal of Respiratory and Critical Care Medicine. 168 (9): 1034–42. doi:10.1164/rccm.200212-1525OC. PMID 12869359.

"Continuous oxygen supply for non-pressurised cabins". The Wayback Machine. Oxyfly. Archived from the original on 10 June 2012. Retrieved 26 April 2018.

"How do Portable Oxygen Concentrators work?". Oxygensolutions.com. Retrieved 26 April 2018.

"How Does My Oxygen Concentrator Work?". oxygenworldwide.com. 18 March 2015. Retrieved 26 April 2018.

United States Grant US4477264A, Wilbur C. Kratz & Shivaji Sircar, "Pressure swing adsorption process for a medical oxygen generator for home use", published 16 October 1984
United States Grant US5827358A, Stanley Kulish & Robert P. Swank, "Rapid cycle pressure swing adsorption oxygen concentration method and apparatus", published 27 October 1998

Waters, Allison (7 November 2012). "Choosing the Best Portable Oxygen Concentrator: Start with the Flow". POC News & More. Retrieved 30 July 2014.

Wenborg M.D., Craig (6 August 2008). "The Esthetic Benefits of Oxygen Skin Care". Skin Inc. Magazine. Retrieved 26 April 2018.

Meek, James (28 June 2001). "It's a gas". The Guardian. Retrieved 26 April 2018.

Jindal, S.K. (2008). "Oxygen Therapy: Important Considerations" (PDF). Indian J Chest Dis Allied Sci. 50 (1): 97–107. ISSN 0377-9343. OCLC 02594075. PMID 18610694. Archived from the original (PDF) on 12 July 2020. Retrieved 26 April 2018.
"Supplemental Oxygen". The Wayback Machine. American Lung Association. Archived from the original on 6 September 2015. Retrieved 26 April 2018.
"Continuous oxygen supply for non-pressurised cabins". The Wayback Machine. Oxyfly. Archived from the original on 10 June 2012. Retrieved 26 April 2018.

Jindal, S.K. (2008). "Oxygen Therapy: Important Considerations" (PDF). Indian J Chest Dis Allied Sci. 50 (1): 97–107. ISSN 0377-9343. OCLC 02594075. PMID 18610694. Archived from the original (PDF) on 12 July 2020. Retrieved 26 April 2018.