H. Krappe: Senior scientist at the Hahn-Meitner-Institut Berlin, 1966-1998; Visiting Scientist in Los Alamos National Laboratory, 1978-1979; collaboration with R. Nix on mass formulae and nuclear fission; Visiting Professor at the State Univ. of New York at Stony Brook, 1979.
K. Pomorski: Professor at the Marie Curie Sklodowska University in Lublin, 1972-(2015); Visiting Scientist in: the Int. Inst. for Nuclear Research in Dubna, 1976-1977; Technische Universität München, 1978-1980; Universität Regensburg, 1984-86; Institute for Nuclear Research in Strasbourg 1991-92; Visiting Professor at: the Technische Universität München, 1997/98 (DFG Fellow); The Louis Pasteur University in Strasbourg 2001-2003 (12 months of the P.A.S.T. professeur)