1. Abbate, E., Facibeni, P., Gregnanin, A., Merla, G., and Sagri, M. (1969) Basalt flows and related sandstones in Socota area (Northern Ethiopia), Boll. Soc. Geol. It.
88, 499–516.
2. Brotzu, P., Ganzerli-Valentini, M. T., Morbidelli, L., Piccirillo, E. M., and Traversa, G. (1981) Basaltic volcanism in the northern sector of the Main Ethiopian Rift, J. Volc. Geoth. Res., 10, 365–382.
3. Burnham, W., Clark, J. R., Papike, J. J., and Prewitt, (1967) A proposed crystallographic nomenclature for clinopyroxene structures, Z Krist.
125, 1–6.
4. Clark, J. R., Appleman, D. E., and Papike, J. J. (1969) Crystal-chemical characterization of clinopyroxenes based on eight new structure refinements, Miner. Soc. Amer. Spec. Pap.
2, 31–50.
5. Dowty, E., and Clark, J. R. (1973) Crystal structure refinement and optical properties of a Ti3+ fassaite from the Allende meteorite, Amer. Miner.
58, 230–242.