Wallentin, M., Østergaard, S., Lund, T. E., Østergaard, L. & Roepstorff, A. (2005).
Concrete spatial language: see what I mean? Brain and Language,
92(3), 221-33.
https://doi.org/10.1016/j.bandl.2004.06.106
Mogensen, F.
& Breiting, S. (2005).
Country report Denmark. In
ECO-schools: trends and divergences: A comparative study on ECO-school development processes in 13 countries (1. ed.). Stollfuß Medien.