TY - JOUR TI - Interregional and International Telephone Communication- Aggregate Trafic Models and Empirical Evidence for Austria DO - na SP - 121 EP - 135 PY - 1993-01-01 JO - Sistemi Urbani AU - Fischer, Manfred M. AU - Essletzbichler, Jürgen AU - Gassler, Helmut AU - Trichtl, Gerhard ER -