Citation: Alonso, J.A.; Garcia-Munoz, J.L.; Casais, M.T.; Martinez-Lope, M.J.; Fernandez-Diaz, M.T. (2000). Room-temperature monoclinic distortion due to charge disproportionation in R Ni O3 perovskites with small rare-earth cations (R= Ho, Y, Er, Tm, Yb and Lu): a neutron diffraction study. Physical Review, Serie 3. B - Condensed Matter (18,1978-), 61, pp. 1756-1763.