A.E. de Vries: Some chemical problems connected with the electro-magnetic separation of isotopesIn: Electromagnetic Separation of Radioactive Isotopes : Proceedings of the International Symposium held in Vienna, May 23-25, 1960 /ed. M.J. Higatsberger and F.P. Viehb, Cham: Springer, 1961. - pp. 250-256