TY - JOUR A1 - Kroner, Alfred A1 - Oberhänsli, Roland A1 - Mezger, Klaus A1 - Teklay, M. T1 - Geochemistry, Pb-Pb single zircon ages and Nd-Sr isotope composition of Precambrian rocks from southern and eastern Ethiopia: implications for crustal evolution in east Africa Y1 - 1998 ER -