1. Lindén, C.G., Bergström, I., Blomqvist, J., Rensfelt, K.-G., Sergolle, H., Westerberg, K.: Z. Physik A277, 873 (1976)
2. Bergström, I.: Lecture held at Summer School, Mikotajki, Poland, Sept. 75
3. Lindén, C.G., Bergström, I., Blomqvist, J.: Research Institute of Physics 1975 Annual Report 3.4.11
4. Bergström, I., Blomqvist, J., Fant, B., Filevich, A., Lindén, C.G., Rensfelt, K.-G., Sztarkier, J., Wikström, K.: Physica Scripta3, 11 (1971)
5. Bergström, I., Blomqvist, J., Filevich, A., Lindén, C.G.: Physica Scripta8, 5 (1973)