{"id":"001203825","type":"book","title":"Identifizierung von Betulin in prähistorischen Pechfunden mittels 13C-NMR-Spektroskopie","publisher":"Staatliche Museen zu Berlin, Generalverwaltung","pages":"241-250","container-title":"Berliner Beiträge zur Archäometrie, 16 (1999","author":[{"family":"Fröhlich","given":"Jiří"}],"issued":{"raw":"1999"}}