@book{Bönke2007,
author = {Bönke, Timm and Schröder, Carsten},
year = {2007},
isbn = {3-938369-69-8},
language = {eng},
copyright = {http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen},
title = {Equivalence scales reconsidered},
url = "http://dx.doi.org/10.17169/FUDOCS_document_000000000233",
}