Citation: Grins, J.; Shen, Z.; Esmaeilzadeh, S.; Berastegui, P. (2001). The structures of the Ce and La N-phases RE3 Si8-x Alx N11-x O4+x (x = 1.75 for RE = Ce, x = 1.5 for RE = La), determined by single-crystal X-ray and time-of-flight neutron powder diffraction,respectively. Journal of Materials Chemistry, 11, pp. 2358-2362.