@book {TN_libero_mab2,
author = { Christoffel, Elwin Bruno Maurer, Ludwig },
title = { Gesammelte mathematische Abhandlungen },
publisher = {Teubner},
year = {19XX-},
address = { Leipzig },
url = { http://slubdd.de/katalog?TN_libero_mab2 }
}
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