Strongly disordered heisenberg spin-1 chains: vanadium warwickites - Continentino, M. A.; Fernandes, J. C.; Guimarães, R. B.; Boechat, B.; Borges, H. A.; Valarelli, José Vicente; Haanappel, E.; Lacerda, Alex; Silva, P. R. J. (Philosophical Magazine B, 1996)