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1992

Fischer, Manfred M. and Essletzbichler, Jürgen and Gassler, Helmut and Trichtl, Gerhard (1992): Interregional and International Telephone Communication. Aggregate Traffic Model and Empirical Evidence for Austria. Published in: Sistemi Urbani , Vol. 15, No. 2/3 (1993): pp. 121-135.

Fischer, Manfred M. and Essletzbichler, Jürgen and Gassler, Helmut and Trichtl, Gerhard (1992): Telephone Communication Patterns in Austria A Comparison of the IPFP based Graph-Theoretic and the Intramax Approaches. Published in: Geographical Analysis , Vol. 25, No. 3 (1993): pp. 224-233.