?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Cancellieri&rft.au=Cancellieri%2C+E&rft.aufirst=E&rft.date=1+December+2014&rft.issue=21&rft.atitle=Merging+of+vortices+and+antivortices+in+polariton+superfluids&rft.issn=1098-0121&rft.title=Physical+Review+B&rft.volume=90&rft.genre=article