@book{id_11497,
author = "Spengel, Leonhard",
title = "Ueber die katharsis ton mathematon",
year = "1860",
address = "München",
publisher = "Akad. der Wiss.",
series = "Abhandlungen",
volume = "9,1",
url = "http://publikationen.badw.de/de/003204974",
}