Larsen, A. C., Guttormsen, M., Blasi, N., Bracco, A., Camera, F., Campo, L. C., Eriksen, T. K., Görgen, A., Hagen, T. W., Ingeberg, V. W., Kheswa, B. V., Leoni, S., Midtbø, J. E., Million, B., Nyhus, H. T., Renstrøm, T., Rose, S. J., Ruud, I. E., Siem, S., Tornyi, T. G., Tveten, G. M., Voinov, A. V., Wiedeking, M., & Zeiser, F. (n.d.). low-energy enhancement and fluctuations of γ-ray strength functions in 56, 57Fe: test of the Brink–Axel hypothesis. Journal of physics, 44, . http://access.bl.uk/ark:/81055/vdc_100087639969.0x000041