au.\*:("KEYS LK")
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ECONOMICAL LINE FILTERING FOR BUSINESS COMMUNICATION SYSTEMS.MIKHAEL WB; KEYS LK.1974; I.E.E.E.J. SOLID-STATE CIRCUITS; U.S.A.; DA. 1974; VOL. 9; NO 4; PP. 196-199; BIBL. 7 REF.Article
STANDARDIZABLE LOW-PASSVOICE BAND HYBRID CIRCUIT FILTERS FOR PULSE CODE MODULATIONS (PCM) COMMUNICATION SYSTEMS.MIKHAEL WB; KEYS LK.1975; I.E.E.E. J. SOLID STATE CIRCUITS; U.S.A.; DA. 1975; VOL. 10; NO 4; PP. 229-236; BIBL. 12 REF.Article