@article{Thönnissen2017,
author = {Thönnissen, C. and Wilhelm, B. and Alt, P. and Friedrich, S. and Walper, S.},
title= {Pairfam scales and instruments manual},
year = {2017},
URL = {http://www.pairfam.de/fileadmin/user_upload/redakteur/publis/Dokumentation/Manuals/Scales_Manual_pairfam_8.0.pdf},
}