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TUNABLE NOTCH FILTER SUPPRESSES HUM.LEFFERSON P.1976; ELECTRONICS; U.S.A.; DA. 1976; VOL. 49; NO 18; PP. 100Article
CONSTANT PRESURE FLUID PUMP ADAPTIVE CONTROL SYSTEM.LEFFERSON P.1977; P.E.E.E. TRANS. INDUSTR. ELECTRON. CONTROL INSTRUMENT.; U.S.A.; DA. 1977; VOL. 24; NO 4; PP. 313-316; BIBL. 3 REF.Article
