@book {TN_libero_mab2,
author = { Nyffeler, Arthur },
title = { Die Betonmischung },
publisher = {Verlag Technische Rundschau im Hallwag-Verl.},
keywords = { Beton },
year = {1971},
address = { Bern },
url = { http://slubdd.de/katalog?TN_libero_mab2 }
}
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