1. H. Weyl,The Classical Groups, their Invariants and Representations. Princeton Univ. Press (1946).
2. E. T.Onat, Effective properties of elastic materials that contain penny shaped voids,Int. J. Eng. Sci. 22 (1984) 1013–1021.
3. J. H. Grace and A. Young,The Algebra of Invariants, Cambridge Univ. Press (1903) (reprinted by Chelsea Publ. Co. in 1965).
4. J. Sylvester,Tables of the generating functions and groundforms for the binary quantics of the first ten orders, Collected mathematical papers of J. J. Sylvester, vol. III, Cambridge Univ. Press (1909) pp. 283–311. J. Sylvester,Sur les covariants irréductibles du quantic binaire de huitième order, ibid., 481–488.
5. vonGall,Das vollständige Formensystem einer binären Form achter Ordnung.Matematische Annalen 17 (1880) 31–51, 139–152, 456.