1. Boerner,H.: Darstellungen von Gruppen, zweite Auflage. Berlin: Springer Verlag 1967. English Translation: Representations of groups, 2'nd Edition. Amsterdam: North Holland Publishing Co., 1970. The foll owing chapter and page numbers refer to the second German edition: (a) Kap. II.2, pp. 28?9; (b) Kap. III, Satz 3.9, p. 58; (c) Kap. IV, Satz 2.5, p. 106; (d) Kap. IV, Satz 2.8, 2.9, p. 107; (e) Kap. IV, Satz 2.1, p. 104; (f) Kap. III, Satz 3.8, p. 58; (g) Kap. IV, Satz 3.2, p. 109; (h) Kap. IV, p. 110; (i) Kap. IV, Satz 4.4, p. 111; (j) Kap. III.4, pp. 60?67; (k) Kap. III, Satz 13.1, p. 92.
2. Frame,J.S.: Nagoya Math. J. 27, 585 (1966).
3. Haase,D., Ruch,E.: Theoret. chim. Acta (Berl.) 29, 189 (1973).
4. Haase,D., Ruch,E.: Theoret. chim. Acta (Berl.) 29, 247 (1973).
5. Hamermesh,M.: Group theory. Reading, Mass.: Addison-Wesley, 1962. Ch. 7?12, pp. 249?54