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HILLAN AB, 1947, J I ELECT ENG LOND, V94, P42
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A new type of selective circuit and some applications
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A TUNABLE AUDIO-FREQUENCY AMPLIFIER OF VARIABLE SELECTIVITY
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THEORY AND APPLICATION OF PARALLEL-T RESISTANCE-CAPACITANCE FREQUENCY-SELECTIVE NETWORKS
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A STABLE SELECTIVE AUDIO AMPLIFIER
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TERMAN FE, 1939, P IRE, V27, P649
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YATES HG, 1946, ENG LOND, V181, P515