@article{Marziani:94451,
      author        = "Marziani, P. and Olmo, A. del and Martínez-Carballo, M.A.
                       and Martínez-Aldama, M.L. and Stirpe, G.M. and Negrete,
                       C.A. and Dultzin, D. and D’Onofrio, M. and Bon, E. and
                       Bon, N.",
      title         = "{Black hole mass estimates in quasars. A comparative
                       analysis of high- and low-ionization lines}",
      year          = "2019",
}