Troje, NF 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.sciencedirect.com/science/article/pii/S0042698998001539 (Publisher version)
Troje, N., Huber, L., Loidolt, M., Aust, U., & Fieder, M. (1999). Categorical learning in pigeons: the role of texture and shape in complex static stimuli. Vision Research, 39(2), 353-366. doi:10.1016/S0042-6989(98)00153-9.