Study of the ferrodistorsive orbital ordering in NaNiO2 by neutron diffraction and submillimeter wave ESRE. Chappel, M. D. Núñez-Regueiro, G. Chouteau, O. Isnard and C. DarieEur. Phys. J. B, 17 4 (2000) 615-622DOI: https://doi.org/10.1007/s100510070099