1. J.M. Laget, Nucl. Phys. A 312, 265 (1978).
2. J. M. Laget, in Lecture Notes in Physics, Vol. 137, Ed. by H. Arenhovel and A. M. Saruis (Springer, Berlin, 1981), p. 148.
3. B. S. Ishkhanov and V. N. Orlin, Yad. Fiz. 66, 1269 (2003) [Phys. At. Nucl. 66, 1229 (2003)].
4. B. S. Ishkhanov and V. N. Orlin, Yad. Fiz. 67, 614 (2004) [Phys. At. Nucl. 67, 595 (2004)].
5. B. S. Ishkhanov and V. N. Orlin, Fiz. Élem. Chastits At. Yadra 38, 460 (2007) [Phys. Part. Nucl. 38, 232 (2007)].