P. C.M. Planken - Delft University of Technology
P. C. Van Son - Delft University of Technology
J. N. Hovenier - Delft University of Technology
T. O. Klaassen - Delft University of Technology
W. Th Wenckebach - Delft University of Technology
B. N. Murdin - Institute for Atomic and Molecular Physics
G. M.H. Knippels - Institute for Atomic and Molecular Physics