@TechReport{artaso2016,
  author      = {M. A. Artaso and F. J. D\'{\i}ez},
  title       = {Empirical comparison of visual analog scales and three versions of the time trade-off. A study on cochlear implantation},
  institution = {UNED},
  year        = {2016},
  type        = {{Technical Report CISIAD-16-01}},
  address     = {Madrid, Spain},
}