Knauff, M Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society; Max Planck Institute for Biological Cybernetics, Max Planck Society;
https://www.tandfonline.com/doi/abs/10.1207/s15427633scc0402_3 (Publisher version)
Knauff, M., Strube, G., Jola, C., Rauh, R., & Schlieder, C. (2004). The psychological validity of qualitative spatial reasoning in one dimension. Spatial Cognition and Computation, 4(2), 167-188. doi:10.1207/s15427633scc0402_3.