1. Wang Nai Yang, Karzhavina, E.N., Popov, A.B., Yazvitskij, Yu.S., Jao Chi Chuan.: Yad. Fiz. 3 (1966) 48; Sov. Nucl. Phys. 3 (1966) 34. Exfor 40030.
2. Mughabghab, S.F., Chrien, R.E.: Phys. Rev. 174 (1968) 1400. Exfor 12130.
3. Ritter, J.C., Namenson, A.I.: J. Bull. Am. Phys. Soc. (1969) 515.
4. Ritter, J.C., Namenson, A.I.: Nucl. Phys. A 173 (1971) 477.
5. Liou, H.J., Camarda, H.S., Hacken, G., Rahn, F., Rainwater, J., Slagowits, M., Wynchank, S.: Phys. Rev. C 7 (1973) 823. Exfor 10081.