@book {TN_libero_mab2,
author = { Schelzel, Manfred AND Sommer, Günter },
title = { Marktforschung im Schiffbau },
publisher = {Trans-press},
year = {[19]61},
address = { Berlin },
url = { http://slubdd.de/katalog?TN_libero_mab2 }
}
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