@electronic{www.uni-kassel.de,
   title       = {Systematik BB7 Elektrotechnik}, 
   url         = {http://www.uni-kassel.de/ub/suchen-finden/fachlicher-einstieg/systematiken/55.html},
   biburl      = {https://puma.uni-kassel.de/url/1e63f62676678d7ad5ab81bc1fe71303/stefani},
   keywords    = {bb7 bestand elektrotechnik et etec etechnik systematik ubfr},
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@electronic{opac.tib.uni-hannover.de,
   title       = {TIBUB - Katalog der Technischen Informationsbibliothek und Universitätsbibliothek Hannover - results/shortlist}, 
   url         = {http://opac.tib.uni-hannover.de/DB=1/SET=4/TTL=1/CMD?ACT=SRCHA&IKT=1016&SRT=YOP&TRM=%28%28%28dtm+201112%3F+%29%29+AND+%28bkl+53.%3F+or+ddc+621.3%3F+or+sst+l+elt%3F%29%29},
   biburl      = {https://puma.uni-kassel.de/url/ad073bb4bfb093c5b3c5c5847ade1c40/stefani},
   keywords    = {elektrotechnik neuerwerbungen ssg tib ubfr},
   added-at    = {2012-01-05T10:04:49.000+0100},
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