?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Pham%2C+Toan+Thang&rft.aulast=Pham&rft.aufirst=Toan+Thang&rft.volume=55&rft.date=2016&rft.atitle=Effects+of+variable+thickness+and+imperfection+on+nonlinear+buckling+of+Sigmoid-functionally+graded+cylindrical+panels&rft.title=J.+Composite+Structures&rft.pages=99-106&rft.genre=article