https://theconversation.com/de-la-arcilla-al-movil-antiguos-y-nuevos-diccionarios-224706
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef20058en.pdf
https://www.economiesuisse.ch/fr/print/pdf/node/48318
http://ecipe.org/app/uploads/2018/04/DTRI-final1.pdf