Seinber, L., Yamamoto, T., Tassel, C., Kobayashi, Y., Hayashi, N., Kitada, A., Sumida, Y., Watanabe, T., Nishi, M., Ohoyama, K., Yoshimura, K., Takano, M., Paulus, W. and Kageyama H. (2011) Fe-Site Substitution Effect on the Structural and Magnetic Properties in SrFeO2. Inorganic Chemistry, 50, 3988-3995.