Östberg , E., U. Auner, M. Enlund, H. Zetterström, and L. Edmark. “Minimizing Atelectasis Formation During General anaesthesia—oxygen Washout Is a Non-Essential Supplement to PEEP”. Upsala Journal of Medical Sciences, vol. 122, no. 2, Apr. 2017, pp. 92–98, doi:10.1080/03009734.2017.1294635.