Jörg Keller: Carbonatitic volcanism in the Kaiserstuhl alkaline complex: Evidence for highly fluid carbonatitic melts at the earth's surface. In: Journal of Volcanology and Geothermal Research. Band9, Nr.4, März 1981, ISSN0377-0273, S.423–431, doi:10.1016/0377-0273(81)90048-2.
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Jörg Keller: Carbonatitic volcanism in the Kaiserstuhl alkaline complex: Evidence for highly fluid carbonatitic melts at the earth's surface. In: Journal of Volcanology and Geothermal Research. Band9, Nr.4, März 1981, ISSN0377-0273, S.423–431, doi:10.1016/0377-0273(81)90048-2.