H.A. Tasman and T. Babeliowsky, Influence of the temperature of the condensing wall on the pumping speed of a glass mercury diffusion pump, Rev. Sci. Instrum. 33, 872-873 (1962)
J. van Eck, F.J. de Heer and J. Kistemaker: Interaction of Li+ ions with H2 and He in the energy range of 5 to 25 keVIn: Proceedings Fifth International Conference on Ionization Phenomena in Gases, Munich 28 August - 1 September 1961, Vol. 1 /ed. H. Maecker, North-Holland, 1962. - pp. 54-59