C.A. Bank, Kinetics of the isotopic exchange in the system CO2-O2 with 18O tracer in a transparent quartz vessel, J. Inorg. Nucl. Chem. 7, 145-146 (1958)
J. Schutten, H.W. Baron, T. van der Hauw and P.J. van Deenen, Dynamic measurement of film-thickness in gas bearings, Appl. Sci. Res. A 7, 429-436 (1958)