Penc, K. Max Planck Institute for the Physics of Complex Systems, Max Planck Society;
Penc, K., Mambrini, M., Fazekas, P., & Mila, F. (2003). Quantum phase transition in the SU(4) spin-orbital model on the triangular lattice. PHYSICAL REVIEW B, 68(1): 012408. doi:10.1103/PhysRevB.68.012408.