H. Maecker

van Eck, J., de Heer, F. J., & Kistemaker, J. (1962). Interaction of Li+ ions with H2 and He in the energy range of 5 to 25 keV. In H. Maecker (Ed.), Proceedings Fifth International Conference on Ionization Phenomena in Gases, Munich 28 August - 1 September 1961, Vol. 1 (pp. 54–59).