?url_ver=Z39.88-2004&rft_id=10.1016%2FS0304-3975(02)00774-0&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=De+Nicola&rft.aufirst=Rocco&rft.au=De+Nicola%2C+Rocco&rft.pages=179-189&rft.issn=0304-3975&rft.volume=302&rft.title=Theoretical+Computer+Science&rft.date=2003&rft.issue=1-3&rft.atitle=Nondeterministic+regular+expressions+as+solutions+of+equational+systems&rft.genre=article