Siqueira, A.F.; Fittipaldi, I.P. - In: Physica A: Statistical Mechanics and its Applications 138 (1986) 3, pp. 592-611
A new type of effective-field theory that has recently been used with success for many applications concerning the usual two-state Ising model is herein extended to the Blume-Capel model. The method, which can explicitly and systematically include correlation effects, is illustrated in several...