International Conference on Communications'90; conference record. 2 International Conference on Communications'90; conference record. 1 International Conference on Communications'90; conference record. 3 International Conference on Communications'90; conference record. 4 International Conference on Communications'90; conference record 1976 International Conference on Communications, conference record. 2 International conference on communications'86; conference record. 1 International conference on communications'86; conference record. 3 1976 International Conference on Communications, conference record. 1 1976 International Conference on Communications, conference record. 3