Elasha, Balgis Osman, et al. “Balgis Osman-Elasha, Erika Spanger-Siegfried, Nagmeldin Goutbi, Sumaya Zakicldin and Ahmed Hanafi”. Annals of Arid Zone, vol. 44, no. 3 & 4, Dec. 2016, https://epubs.icar.org.in/index.php/AAZ/article/view/66148.