Duda, A. & Schmincke, H.-U. (1978)

Duda, A. & Schmincke, H.-U. (1978): Quaternary basanites, melilite nephelinites and tephrites from the Laacher See area (Germany). Neues Jahrbuch für Mineralogie - Abhandlungen, Bd. 132, S. 1-33. ISSN 00777757