Nayfeh, A. H. (1973). Perturbation methods. New Jersey: John Wiley & Sons.
Trích dẫn kiểu ChicagoNayfeh, Ali Hasan. Perturbation Methods. New Jersey: John Wiley & Sons, 1973.
Deismireacht MLANayfeh, Ali Hasan. Perturbation Methods. New Jersey: John Wiley & Sons, 1973.
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