Time & Frequency science utilization and space station Spallicci, A. ; Drewes, H. ; Graf, E. ; Hahn, J. ; Ilk, K. H. ; Salomon, C. ; Soffel, M. ; Thiel, K. -H. ; Veillet, C. ; Weber, K. H. ; Wehr, A. Abstract Publication: New generation of space clocks Workshop of 11 th European Frequency and Time forum Pub Date: 1997 Bibcode: 1997ngsc.conf..678S