@article{Witzel2000,
author = {Witzel, A.},
title= {The problem-centered interview},
year = {2000},
URL = {http://www.qualitative-research.net/fqs-texte/1-00/1-00witzel-e.htm},
journal = {Forum Qualitative Sozialforschung /Forum: Qualitative Social Research},
volume = {1},
number = {1},
}