1. Björner, A., Las Vergnas, M., Sturmfels, B., White, N., Ziegler, G.: Oriented Matroids. Encyclopedia of Mathematics and its Applications, vol. 46. Cambridge University Press, Cambridge, MA (1999)
2. Demonet, L.: Mutations of Group Species with Potentials and their Representations. Applications to Cluster Algebras, Preprint (2010). (arXiv:1003.5078)
3. Demonet, L.: Personal communication (2012)
4. Derksen, H., Weyman, J., Zelevinsky, A.: Quivers with potentials and their representations II: applications to cluster algebras. J. Am. Math. Soc. 23(3), 749–790 (2010)
5. Fock, V.V., Goncharov, A.B.: Cluster ensembles, quantization and the dilogarithm. Ann. Sci. Éc. Norm. Supér. (4) 42(6), 865–930 (2009)