Citation: Gerard Tob\'ias; Daniel Beltr\'an-Porter; Oleg I. Lebedev; Gustaaf Van Tendeloo; Juan Rodr\'iguez-Carvajal; Amparo Fuertes (2004). Anion Ordering and Defect Structure in Ruddlesden-Popper Strontium Niobium Oxynitrides. Inorganic Chemistry, 43, pp. 8010-8017.