Percolation and Gibbs states multiplicity for ferromagnetic Ashkin-Teller models on Z2

Name: Percolation and Gibbs states multiplicity for ferromagnetic Ashkin-Teller models on Z2
Author: /author/Danica_McKellar_(Math_Doesn%27t_Suck%3A_How_to_Survive_Middle_School_Math_Without_Losing_Your_Mind_or_Breaking_a_Nail)