@techreport{itb2210,
  author = {Straka, Gerald A.},
  title = {Informal learning: genealogy, concepts, antagonisms and questions},
  year = {2004},
  series = {ITB-Forschungsberichte},
  number = {15/2004},
  publisher = {Universität Bremen, Institut Technik und Bildung},
  doi = {10.26092/elib/3428},
  language = {en},
}