Tectonic evolution of a Pan-African gneiss culmination, Gabal El Sibai area, Central Eastern desert, Egypt - Ṣābir, Ğamāl Muḥammad Kamāl-ad-Dīn; Khudeir, Ali Abdelkader Abdalla; Greiling, Reinhard O. (Strukturelle Reaktivierung in Afrika, 1992)