Modified spin-wave theory for the S = 1 frustrated antiferromagnetic Heisenberg chain G. M. Rocha-Filho, A. S.T. Pires and M. E. Gouvêa Eur. Phys. J. B, 56 1 (2007) 7-14 Published online: 21 March 2007 DOI: 10.1140/epjb/e2007-00082-x