Abstract
The authors show the existence of additional ferromagnetic phases and transition lines in the mean-field calculations of Benyoussef and collaborators (see J. Phys. C: Solid State Phys., vol.20, p.5349, 1987) for the phase diagram of a spin-1 Ising model in a random crystal field Delta i with probability distribution P( Delta i)=p delta ( Delta i- Delta )+(1-p) delta ( Delta i).
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