?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Nguyen%2C+Thi+Cam+Lai&rft.aulast=Nguyen&rft.aufirst=Thi+Cam+Lai&rft.date=2014&rft.title=An+Approximation+to+the+Characteristic+Equation+of+Multiple+Cracked+Beam&rft.genre=proceeding