- Deutscher Landwirtschaftsverlag Berlin GmbH, (1994)
- DASC, page 577-584. IEEE, (2011)
- Verwaltungsrecht zwischen Freiheit, Teilhabe und Bindung, (1978)
- Beck, München, (1971)
- Beck, München, 12 edition, (2011)
- Computer Physics Communications 183(3):530-542 (2012)
- ICLS 2, page 359-365. International Society of the Learning Sciences, (2008)
- Bioinformatics (August 2011)
- INTERSPEECH, page 2057-2060. ISCA, (2011)
- ICCE, page 392-393. (2002)
- CSCL, page 145-154. International Society of the Learning Sciences, (2005)
- CSCL, page 385-394. International Society of the Learning Sciences / ACM DL, (2007)
- CSCL 1, page 151-160. International Society of the Learning Sciences, (2009)
- CoRR (2010)
- Bell Labs Technical Journal 16(3):47-60 (2011)
- ICSR, volume 7072 of Lecture Notes in Computer Science, page 31-41. Springer, (2011)
- Cognitive Processing 12(4):317-318 (2011)
- Artificial Life 6(1):3-23 (2000)
- IGARSS, page 758-760. IEEE, (2010)
- Computers & Education 58(1):12-20 (2012)


author