“…The three possibilities of disorder in the BEG model and its combinations have been treated also in several techniques, such as mean field, renormalization group, Bethe lattice, transfer matrix, cluster variation, effective field theory (see, for instance, Refs. [14,19,20,21,22,23,24,25,26,27,28,29,30,31]). In the case of the random crystal field field displayed in Ref.…”