TY - JOUR T1 - Applying the method of normal forms to second-order nonlinear vibration problems JO - Proceedings of the Royal Society of London A PY - 2011/01/01 AU - Neild SA AU - Wagg DJ ED - DO - DOI: 10.1098/rspa.2010.0270 VL - 467 SP - 1141 EP - 1163 Y2 - 2025/11/03 ER -