TY - JOUR T1 - Non-linear systems in the frequency domain: energy transfer filters JO - INT J CONTROL PY - 2002/09/01 AU - Billings SA AU - Lang ZQ ED - DO - DOI: 10.1080/00207170210157575 VL - 75 IS - 14 SP - 1066 EP - 1081 Y2 - 2024/12/25 ER -