Geißler, Marion; Breitkreuz, Christoph; Kiersnowski, Hubert (1 вересня 2008). Late Paleozoic volcanism in the central part of the Southern Permian Basin (NE Germany, W Poland): facies distribution and volcano-topographic hiati. International Journal of Earth Sciences (English) . 97 (5): 976. Bibcode:2008IJEaS..97..973G. doi:10.1007/s00531-007-0288-6. ISSN1437-3254. S2CID129700410.
Khadam, A. M. A.; Ramadan, K.; Hamouda, E. A. (2018). Geothermal Mainstream Adoption through Risk Mitigation in Sudan. 2018 International Conference on Computer, Control, Electrical, and Electronics Engineering (ICCCEEE). с. 7. doi:10.1109/ICCCEEE.2018.8515898. ISBN978-1-5386-4123-1. S2CID53635777.
Geißler, Marion; Breitkreuz, Christoph; Kiersnowski, Hubert (1 вересня 2008). Late Paleozoic volcanism in the central part of the Southern Permian Basin (NE Germany, W Poland): facies distribution and volcano-topographic hiati. International Journal of Earth Sciences (English) . 97 (5): 976. Bibcode:2008IJEaS..97..973G. doi:10.1007/s00531-007-0288-6. ISSN1437-3254. S2CID129700410.
Adelberger, Jörg (1991). Salzherstellung und Salzhandel im Gebiet des Jebel Marra (Darfur/Sudan): Der Rückgang eines lokalen Gewerbes. Paideuma(нім.). 37: 5—14. JSTOR40341621.
Geißler, Marion; Breitkreuz, Christoph; Kiersnowski, Hubert (1 вересня 2008). Late Paleozoic volcanism in the central part of the Southern Permian Basin (NE Germany, W Poland): facies distribution and volcano-topographic hiati. International Journal of Earth Sciences (English) . 97 (5): 976. Bibcode:2008IJEaS..97..973G. doi:10.1007/s00531-007-0288-6. ISSN1437-3254. S2CID129700410.
Khadam, A. M. A.; Ramadan, K.; Hamouda, E. A. (2018). Geothermal Mainstream Adoption through Risk Mitigation in Sudan. 2018 International Conference on Computer, Control, Electrical, and Electronics Engineering (ICCCEEE). с. 7. doi:10.1109/ICCCEEE.2018.8515898. ISBN978-1-5386-4123-1. S2CID53635777.
Geißler, Marion; Breitkreuz, Christoph; Kiersnowski, Hubert (1 вересня 2008). Late Paleozoic volcanism in the central part of the Southern Permian Basin (NE Germany, W Poland): facies distribution and volcano-topographic hiati. International Journal of Earth Sciences (English) . 97 (5): 976. Bibcode:2008IJEaS..97..973G. doi:10.1007/s00531-007-0288-6. ISSN1437-3254. S2CID129700410.