الإتاحة: https://ddd.uab.cat/record/171657Test
الإتاحة: https://ddd.uab.cat/record/99552Test
الإتاحة: http://hdl.handle.net/10261/29020Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::73701ed9c4948c8c3d991dfafe749134Testhttp://hdl.handle.net/10261/29020Test