@article{Dardanoni:231765,
      author = {Dardanoni, Valentino and De Luca, Giuseppe and Modica,  Salvatore and Peracchi, Franco},
      title = {{A generalized missing-indicator approach to regression  with imputed covariates}},
      journal = {Stata Journal},
      volume = {Volume 12},
      number = {Number 4},
      pages = {575. - 32},
      year = {2012},
      doi = {st0273},
}