@book {TN_libero_mab2,
author = { Helfferich, Karl },
title = { Der Weltkrieg },
publisher = {Ullstein & Co.},
keywords = { Erster Weltkrieg },
year = {1919},
address = { Berlin },
url = { http://slubdd.de/katalog?TN_libero_mab2 }
}
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