@misc{Kaelble2014, author = {Hartmut Kaelble}, title = {Historischer Vergleich}, edition = {Version 1.0}, doi = {10.14765/zzf.dok.2.271.v1}, url = {http://docupedia.de/zg/kaelble_historischer_vergleich_v1_de_2012}, type = {webpublication}, year = {2014}, }