Hollmann, N., Valldor, M., Wu, H., Hu, Z., Qureshi, N., Willers, T., Chin, Y. Y., Cezar, J. C., Tanaka, A., Brookes, N. B., & Tjeng, L. H. (2011). Orbital occupation and magnetism of tetrahedrally coordinated iron in CaBaFe4O7. Physical Review B, 83(18):, pp. 180405-1-180405-4. doi:10.1103/PhysRevB.83.180405.