Neutron diffraction study of the magnetic ordering in the series R2BaNiO5 (R = Rare Earth) E. García-Matres, J.L Martínez and J. Rodríguez-Carvajal Eur. Phys. J. B, 24 1 (2001) 59-70 Published online: 15 November 2001 DOI: 10.1007/s100510170022