الإتاحة: https://doi.org/10.1127/ejm/2017/0029-2597Testhttp://hdl.handle.net/11585/719236Testhttp://www.ingentaconnect.com/content/schweiz/ejmTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fb2461e35d8cd53ddc3c28ab7fc3ab04Testhttps://hal.archives-ouvertes.fr/hal-02124463Test