@misc{Roentgen_Wilhelm_Konrad_[List,
 author={Roentgen, Wilhelm Konrad},
 address={Würzburg},
 howpublished={online},
 language={ger},
 type={text},
 title={[List do Otto Lummera - Lum. 237]},
 keywords={Enrich Europeana Plus, correspondence},
}