https://www.bde.es/wbe/es/publicaciones/analisis-economico-investigacion/documentos-ocasionales/spanish-survey-household-finances-eff-description-and-methods-2011-wave.html
The Spanish survey of household finances (EFF): description and methods of the 2011 wave
spanish surveyhousehold financeseffdescriptionmethods
https://www.elsevier.es/en-revista-cirugia-espanola-english-edition--436-articulo-assessment-postoperative-morbidity-in-spanish-S2173507724000966
BackgroundThe methodology used for recording, evaluating and reporting postoperative
assessmentpostoperativemorbidityspanishhospitals
https://www.surveymonkey.com/r/WaterburyHousing22Spanish
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housing surveywaterburyspanish