?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Nguyen%2C+Dong+Anh&rft.aulast=Nguyen&rft.aufirst=Dong+Anh&rft.volume=37&rft.date=2014&rft.atitle=Response+Analysis+of+Van+der+Pol+Oscillator+Subjected+to+Harmonic+and+Random+Excitations&rft.title=Probabilistic+Engineering+Mechanics&rft.pages=51-59&rft.genre=article