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3. S. Yamamoto et al., “An Algorithm of Adaptive Echo Canceller with Linear Predictor Considering Effects of Circuit Noise”, Paper of Technical Group TGCS80 - 48, IECE Japan, June 1980
4. “Über die Adaption eines Kompensators für akustische Echos”;Schultheiß;VDI-Fortschritt-Berichte, Reihe,1988
5. “Acoustic Echo Cancellation Using Prediction Residual Signals”;Acker;Eurospeech,1991