Unconventional antiferromagnetic correlations of the doped Haldane gapsystem Y2BaNi1-xZnxO5V. Villar, R. Mélin, C. Paulsen, J. Souletie, E. Janod and C. PayenEur. Phys. J. B, 25 1 (2002) 39-51DOI: https://doi.org/10.1140/e10051-002-0006-x