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Dereje Ayalew, B. Marty, P. Barbey, Gezahegn Yirgu, Endale Ketefo: Sub-lithospheric source for Quaternary alkaline Tepi shield, southwest Ethiopia. In: GEOCHEMICAL JOURNAL. Band40, Nr.1, 2006, ISSN0016-7002, S.47–56, doi:10.2343/geochemj.40.47 (jst.go.jp [abgerufen am 3. August 2019]).
Dereje Ayalew, B. Marty, P. Barbey, Gezahegn Yirgu, Endale Ketefo: Sub-lithospheric source for Quaternary alkaline Tepi shield, southwest Ethiopia. In: GEOCHEMICAL JOURNAL. Band40, Nr.1, 2006, ISSN0016-7002, S.47–56, doi:10.2343/geochemj.40.47 (jst.go.jp [abgerufen am 3. August 2019]).