Unconventional antiferromagnetic correlations of the doped Haldane gapsystem Y2BaNi1-xZnxO5 V. Villar, R. Mélin, C. Paulsen, J. Souletie, E. Janod and C. Payen Eur. Phys. J. B, 25 1 (2002) 39-51 Published online: 15 January 2002 DOI: 10.1140/e10051-002-0006-x