?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Ercolano&rft.au=Ercolano%2C+B&rft.aufirst=B&rft.pages=391-392&rft.issn=1743-9221&rft.title=Proceedings+of+the+International+Astronomical+Union&rft.issue=234&rft.atitle=Three-dimensional+ionisation%2C+dust+RT+and+chemical+modelling+of+planetary+nebulae&rft.volume=2&rft.date=1+April+2006&rft.genre=article