(85.1): W. R. Johnson and G. Soff, At. Data Nucl. Data Tables, U.S.A., 1985, 33, 405-46.

(86.5): C. T. Munger and H. Gould, Phys. Rev. Letters, U.S.A, 1986, 57, 2927-30.

(88.7): P. Indelicato, Nucl. Instrum. Methods Phys. Res. Sect. B, Netherl., 1988, 31, 14-20.