conference paper yes M Hattermann author R vom Hofe author Harry Kullmann author 779720000-0001-5488-5105 37th Conference of the International Group for the Psychology of Mathematics Edu-cation 2013Kiel ger M. Hattermann, R. vom Hofe, and H. Kullmann, “An innovative approach to negative numbers based on the data of the PALMA-Project,” presented at the 37th Conference of the International Group for the Psychology of Mathematics Edu-cation, Kiel, 2013. Hattermann, M., vom Hofe, R., &#38; Kullmann, H. (2013). <i>An innovative approach to negative numbers based on the data of the PALMA-Project</i>. 37th Conference of the International Group for the Psychology of Mathematics Edu-cation, Kiel. M. Hattermann, R. vom Hofe, H. Kullmann, in: 2013. Hattermann, M, R vom Hofe, and Harry Kullmann. “An innovative approach to negative numbers based on the data of the PALMA-Project,” 2013. Hattermann, M., et al. <i>An innovative approach to negative numbers based on the data of the PALMA-Project</i>. 2013. @inproceedings{Hattermann_vom Hofe_Kullmann_2013, title={An innovative approach to negative numbers based on the data of the PALMA-Project}, author={Hattermann, M and vom Hofe, R and Kullmann, Harry}, year={2013} } Hattermann M, vom Hofe R, Kullmann H. An innovative approach to negative numbers based on the data of the PALMA-Project. In: ; 2013. 670742026-09-09T10:36:01Z2026-09-09T10:36:09Z