A comment on 'The classical limit for the Holstein-Primakoff representation in the soliton theory of Heisenberg chains'

Skrinjar and co-workers (see ibid., vol.1, p.725, 1989) used a Holstein-Primakoff operator method to obtain a classical Hamiltonian. It is shown that the same Hamiltonian can be derived directly via averaging over spin coherent states, so the former contains no extra information in the limit s to infinity .