Kolesík, M.; S̆amaj, L. - In: Physica A: Statistical Mechanics and its Applications 179 (1991) 1, pp. 145-157
A family of two-state vertex models on the honeycomb lattice is solved exactly using a generalized weak-graph transformation technique. Two systems are analyzed in detail: the “spin-flip” symmetric model, which is integrable in the whole temperature range, and the symmetric model, solvable...