@article{FerreiraGonzález:58497,
      author        = "Ferreira González, Chelo and López, J. L. and Navarro
                       Belsué, Rafael and Pérez Sinusía, Ester",
      title         = "{Orthogonal basis with a conicoid first mode for shape
                       specification of optical surfaces: Reply}",
      year          = "2016",
}