## References * Sander Wolters, A Comparison of Two Topos-Theoretic Approaches to Quantum Theory, [arXiv:1010.2031](http://arxiv.org/abs/1010.2031) * Andreas Doering, Chris Isham, `What is a Thing?': Topos Theory in the Foundations of Physics, [arXiv:0803.0417](http://arxiv.org/abs/0803.0417) * Radboud University, First Workshop on Quantum Toposophy, [web](http://www.ru.nl/math/research/vmconferences/quantum-toposophy/)