Experiments on preconcentration of impurities in helium gas by thermal diffusion and the measuring of thermal diffusion factors

Velds, C. A., Grotendorst, H. W., Los, J. H., & de Vries, A. E. (1966). Experiments on preconcentration of impurities in helium gas by thermal diffusion and the measuring of thermal diffusion factors. In Dragon Contractors Research and Development Symposium at A.E.R.E. Harwell, in March 1966 (pp. 1–71).