Source: https://apprendre.auf.org/wp-content/opera/13-BF-References-et-biblio-RPT-2014/Traiter%20simultan%C3%A9ment%20des%20variables%20qualitatives%20et%20quantitatives%20%C3%A0%20partir%20de%20mod%C3%A8les%20non%20lin%C3%A9aires.pdf