URL الوصول: http://hdl.handle.net/10803/668725
URL الوصول: https://www.raco.cat/index.php/DER/article/view/317375
URL الوصول: https://www.raco.cat/index.php/DER/article/view/260202
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8e22dd6dfee32a49a87dce253160803bhttp://revistes.ub.edu/index.php/der/article/view/27452