W.A. Oost, J.H. Los, A.N. van der Steege, A.J.H. Boerboom and A.E. de Vries, Measurement of relative diffusion coefficients and thermal diffusion factors of CO2 isotopes in Ar and He, Physica 36, 637-645 (1967)
B. Baranowski, R.A. Haring and A.E. de Vries, The effect of a chemical equilibrium on thermal diffusion: The system N2O4 Û 2NO2 with Ar, Physica 32, 2201-2204 (1966)