P. Shukla, Exact expressions for minor hysteresis loops in the random field Ising model on a Bethe lattice at zero temperature - art. no. 027102, PHYS REV E, 6302(2), 2001, pp. 7102
We obtain exact expressions for the minor hysteresis loops in the ferromagn
etic random field Ising model on a Bethe lattice at zero temperature in the
case when the driving field is cycled infinitely slowly.