?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Tortora%2C+C&rft.aufirst=C&rft.aulast=Tortora&rft.date=23+September+2014&rft.issue=1&rft.issn=1365-2966&rft.atitle=Systematic+variations+of+central+mass+density+slopes+in+early-type+galaxies&rft.title=Monthly+Notices+of+the+Royal+Astronomical+Society&rft.volume=445&rft.pages=115-127&rft.genre=article