<code>
@Book{schultz1988elektrische,
 author = {Schultz, Jürgen},
 title = {Elektrische Messtechnik : Wissensspeicher für die Berufsausbildung},
 publisher = {Verl. Technik},
 year = {1988},
 address = {Berlin, DDR},
 isbn = {3341001417},
 lang = {de},
 sign = {11/00131},
 gbv = {53.15},
 rvk = {},
 url = {},
 thumb = {http://www.antiquariat-artemis.de/images/product_images/popup_images/18199_0.JPG}
}
@Book{gubsch1988messtechnik,
 author = {Gubsch, Gottfried},
 title = {Elektronische Meßtechnik : Lehrbuch für die Berufsausbildung},
 publisher = {Verlag Technik},
 year = {1988},
 address = {Berlin, DDR},
 isbn = {3341000216},
 lang = {de},
 sign = {11/00129},
 gbv = {53.15},
 rvk = {},
 url = {},
 thumb = {http://www.booklooker.de/images/cover/user/0343/8806/MjAxMDAxMTUwOA==.jpg}
}
@Book{gubsch1974messtechnik,
 author = {Gubsch, Gottfried},
 title = {Elektronische Meßtechnik : Lehrbuch für die Berufsausbildung},
 publisher = {Verlag Technik},
 year = {1974},
 address = {Berlin, DDR},
 isbn = {},
 lang = {de},
 sign = {11/00128},
 gbv = {53.15},
 rvk = {},
 url = {},
 thumb = {}
}
@Book{guenzel1973experimentieranleitungen,
 author = {Günzel, Christian},
 title = {Praktisches Schalten, Prüfen, Messen : Experimentieranleitungen für die Berufsausbildung},
 publisher = {Verlag Technik},
 year = {1973},
 address = {Berlin, DDR},
 isbn = {},
 lang = {de},
 sign = {11/00130},
 gbv = {53.15},
 rvk = {},
 url = {},
 thumb = {http://www.buchfreund.de/covers/10747/712006.jpg}
}
</code>