@electronic{portal.dnb.de,
   title       = {DNB, Katalog der Deutschen Nationalbibliothek}, 
   url         = {https://portal.dnb.de/opac.htm?method=simpleSearch&query=idn%3D133968332&cqlMode=true},
   biburl      = {https://puma.uni-kassel.de/url/1c6933b432a0822e047b3f1f87582adc/hotho},
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}

@electronic{portal.dnb.de,
   title       = {DNB, Katalog der Deutschen Nationalbibliothek}, 
   url         = {https://portal.dnb.de/opac.htm?method=simpleSearch&query=idn%3D1015289630&cqlMode=true},
   biburl      = {https://puma.uni-kassel.de/url/5e6005e5d617f60ad8bec0fa7c21b3c1/hotho},
   keywords    = {bibliothek dnb gnd myown},
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