Clerbaux, T., Willems, E., Nullens, W., & Brasseur, L. (1985). Assessment of a Bubble Tonometer As a Quality-control System for Blood-gas Analyzers (po2 and Pco2). Pathologie et Biologie, 33(2), 139-144. https://hdl.handle.net/2078.5/44611 (Original work published 1985)