Magnetic excitations in the spin-1 anisotropic Heisenberg antiferromagnetic chain system ''NiCl IND.2'-4SC'(NH IND.2') IND.2' - Zvyagin, S A; Wosnitza, J; Batista, C D; Tsukamoto, M; Kawashima, N; Krzystek, J; Zapf, V S; Jaime, M; Oliveira Junior, Nei Fernandes de; Paduan-Filho, Armando (Physical Review Letters, 2007)