1. Baxter R.J.: Free-fermion, checkerboard and Z-invariant lattice models in statistical mechanics. Proc. R. Soc. Lond. Ser. A 404(1826), 1–33 (1986)
2. Baxter, R.J.: Exactly Solved Models in Statistical Mechanics. Academic Press Inc. (Harcourt Brace Jovanovich Publishers), London (1989) (Reprint of the 1982 original)
3. Boutillier, C., de Tiliè re, B.: The critical Z-invariant ising model via dimers: locality properties. arXiv:0902.1882, February (2009)
4. Biggs N.: Algebraic graph theory. Cambridge Mathematical Library, 2nd edn. University Press, Cambridge (1993)
5. Bourbaki, N.: Éléments de mathématique. Algèbre. Chapitres 1 à 3. Hermann, Paris(1970)