{{Citat revistă| autor = Mahdavi A.| autor2 = Geller M. J.| titlu = The L_X_-{sigma} relation for galaxies and clusters of galaxies| data = 2001| volum = 554| pagini = 129–132| limba = en| doi = 10.1086/321710| arxiv = astro-ph/0105315| bibcode = 2001ApJ...554L.129M| url = https://iopscience.iop.org/article/10.1086/321710/pdf%7C revistă = The Astrophysical Journal Letters| id = WikidataQ66381047}}
{{Citat revistă| autor = Mahdavi A.| autor2 = Geller M. J.| titlu = The L_X_-{sigma} relation for galaxies and clusters of galaxies| data = 2001| volum = 554| pagini = 129–132| limba = en| doi = 10.1086/321710| arxiv = astro-ph/0105315| bibcode = 2001ApJ...554L.129M| url = https://iopscience.iop.org/article/10.1086/321710/pdf%7C revistă = The Astrophysical Journal Letters| id = WikidataQ66381047}}