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SYSTEM X SOFTWARE ENGINEERINGCOOPER TR; HELLEUR RJ.1980; POST OFF. ELECTR. ENGRS J.; GBR; DA. 1980; VOL. 72; NO 4; PP. 240-246; BIBL. 2 REF.Article

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SYSTEM X1980; ELECTRON. AND POWER; GBR; DA. 1980; VOL. 26; NO 7; PP. 528-554; BIBL. DISSEM.Article

BRITAIN'S SYSTEM X PROJECT. CROSSED LINES FOR TELEPHONE EXPORTERSWILLIAMSON J.1980; NEW SCI.; ISSN 0028-6664; GBR; DA. 1980; VOL. 88; NO 1224; PP. 238-240Article

ARCHITECTURE OF SYSTEM X. I: AN INTRODUCTION TO THE SYSTEM X FAMILYTIPPLER J.1979; POST OFF. ELECTR. ENGRS J.; GBR; DA. 1979; VOL. 72; NO 3; PP. 138-141; BIBL. 3 REF.Article

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