@article { Ratner2001,
title = {Introduction },
author = {Ratner, Carl and Straub, J├╝rgen and Valsiner, Jaan },
journal = {Forum Qualitative Sozialforschung / Forum: Qualitative Social Research },
number = {3 },
volume = {2 },
year = {2001 },
url = {http://nbn-resolving.de/urn:nbn:de:0114-fqs010376 },
}