1. A-TK. AA-K (2014) Optical communication system. https://doi.org/10.5772/58884
2. ACTED (2016) As the water crisis in Yemen deepens, ACTED rehabilitates nine community water points in Al Dhale’e. https://reliefweb.int/report/yemen/water-crisis-yemen-deepens-acted-rehabilitates-nine-community-water-points-al-dhale-e
3. OCHA (2017) UNCT Yemen 2018 Humanitarian needs overview. https://reliefweb.int/report/yemen/yemen-2018-humanitarian-needs-overview-enar
4. Afrane S, Dankwa J, Emmanuel A, Aboagye M (2022) Investigating evolutionary trends and characteristics of renewable energy research in Africa : a bibliometric analysis from 1999 to 2021. Springer, Berlin Heidelberg
5. Afsharzade N, Papzan A, Ashjaee M et al (2016) Renewable energy development in rural areas of Iran. Renew Sustain Energy Rev 65:743–755. https://doi.org/10.1016/j.rser.2016.07.042