الإتاحة: https://doi.org/10.3390/su12083352Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=od______1640::ea24c8854916158d83902ea495df2d9cTesthttps://elib.dlr.de/145985Test/
الإتاحة: http://hdl.handle.net/11420/9801Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f1800f07c33cb365f09d2fac2e6c1914Testhttps://doi.org/10.1016/j.jairtraman.2021.102100Test