?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=YL&rft.au=Fang%2C+YL&rft.aulast=Fang&rft.date=11+March+2014&rft.atitle=Analysis+of+first+order+systems+of+partial+differential+equations&rft.genre=article