Source: https://www.researchgate.net/publication/285387699_Representativite_d'un_corpus_de_terrain_le_choix_du_perimetre_d'investigation/fulltext/5692548e08aed0aed8166ce7/285387699_Representativite_d'un_corpus_de_terrain_le_choix_du_perimetre_d'investigation.pdf