@book {TN_libero_mab2,
author = { Hessel, Alfred },
title = { Geschichte der Stadt Bologna von 1116 bis 1280 },
publisher = {Ebering},
year = {1910},
booktitle = {Historische Studien ; 76},
address = { Berlin },
url = { http://slubdd.de/katalog?TN_libero_mab2 }
}
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