Phase diagrams of spin-1 Ising model with bilinear and quadrupolar interactions under magnetic field. Two-particle cluster approximationR. R. Levitskii, O. R. Baran and B. M. LisniiEur. Phys. J. B, 50 3 (2006) 439-443DOI: https://doi.org/10.1140/epjb/e2006-00162-5