1. Baker, B. H., Mohr, P. A. andWilliams, L. A. J., 1972,Geology of the Eastern Rift System of Africa. Geol. Soc. Am. Special Paper 136.
2. Barberi, F., Borsi, S., Ferrara, G., Marinelli, G. andVaret, J., 1970,Relations Between Tectonics and Magmatology in the Northern Danakil Depression (Ethiopia). Phil. Trans. Roy. Soc. London,267, pp. 293–311.
3. Bloomfield, K., 1965,Infrastructural Ring Complex of Southern Malawi. Malawi Ministry of Natural Resources Memoir No. 4.
4. Comucci, P., 1950,Le Vulcaniti del Lago Tana (Africa Orientale). Atti Accademia Nazionale dei Lincei (Roma).
5. Delaney, F., 1955,Ring Structures in Northern Sudan. Eclogae Geologicae Helvetiae,48, pp. 133–148.