1. Standards for basic intra-operative monitoring—1993; Directory of Members, 1993. American Society of Anesthesiologists, Park Ridge III, pp. 709–710.
2. Evaluation of pulse-oximetry;Yelderman;Anesthesiology,1983
3. The history of blood-gas analysis;Severinghaus;Int. Anesthesiol. Clin.,1987
4. History, status and future of pulse-oximetry;Severinghaus;Adv. Exp. Med. Biol.,1987
5. The unreliability of cyanosis in the recognition of arterial anoxaemia;Comroe;Am. J. Med. Sci.,1947