Submitted on: 25 April 2002.
Revised on: 05 July 2002.
Accepted on: 02 August 2002.
___________________INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS
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Submitted on: 06 July 1998.
Revised on: 21 October 1998.
Accepted on: 02 December 1998.
___________________INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS