@article{Walf2013,
  author    = {Leonard Walf},
  title     = {Binnendifferenzierung im Musikunterricht},
  journal   = {Potsdamer Schriftenreihe zur Musikp{\"a}dagogik},
  number    = {3},
  pages     = {67 -- 70},
  year      = {2013},
}