Date of Original Version

3-1985

Type

Article

Rights Management

©1985 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

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Published In

IEEE Communications Magazine, 23, 3, 35-45.