Niveau transformations WiPSCE'14
Martin Löhnertz. 2014. Niveau transformations: a tool for method classification and lesson planning. In Proceedings of the 9th Workshop in Primary and Secondary Computing Education (WiPSCE '14). ACM, New York, NY, USA, 132-133. DOI=10.1145/2670757.2670771 http://doi.acm.org/10.1145/2670757.2670771
The link address is: http://dl.acm.org/citation.cfm?id=2670771