@incollection{GodsilGroetschelWelsh1995, author = {Godsil, Chris and Gr{\"o}tschel, Martin and Welsh, Dominic}, title = {Combinatorics in Statistical Physics}, booktitle = {Handbook of combinatorics, Volume II, Part IV}, editor = {Graham, Ronald and Gr{\"o}tschel, Martin and Lov{\´a}sz, L{\´a}szlo}, publisher = {Elsevier (North-Holland)}, address = {Amsterdam}, pages = {1925 -- 1954}, year = {1995}, language = {en} }