@misc{Bommer_Heinrich_(1912-_)_Zur,
 author={Bommer, Heinrich (1912- )},
 howpublished={online},
 publisher={Leopold Vossin},
 language={ger},
 title={Zur Kenntnis der Metalle der seltenen Erden},
 type={book},
 keywords={geology, metals, thesis},
}