TY - RPRT TI - Perturbation and harmonic balance methods for nonlinear panel flutter Technical report, 11 Dec. 1969 - 15 Mar. 1971 AU - Dugundji, J. AU - Kuo, C.-C. AU - Morino, L. PY - 1971 UR - https://ntrs.nasa.gov/citations/19710015886 ID - 19710015886 ER -