@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},
}