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Journal of Sound and Vibration329,3182–3202(2010). Primary title page gives full bylines Fai Ma, Matthias Morzfeld and Ali Imam, with UC Berkeley Mechanical Engineering affiliation. Abstract and Introduction describe nonoscillatory free vibration, forced vibration and a time-varying decoupling transformation accounting for both modal damping and forcing effects.

Journal of Sound and Vibration324,408–428(2009); title page gives full bylines Fai Ma, Ali Imam and Matthias Morzfeld and their Mechanical Engineering, UC Berkeley affiliation. Sections2.1–2.2, modal transformation and classical damping, including equation(12), the commutation criterion; section3.1, equation(14), the damped quadratic eigenvalue problem. Repository metadata and article title page agree on authors and publication year.