1. Kac, V. G. (1990) Infinite Dimensional Lie Algebras, CUP Cambridge, England.
2. Grammaticos, B., Ramani, A., and Hietarinta, J. (1994) Multilinear operators: the natural extension of Hirota’s bilinear formalism, Phys. Lett. A.
190, pp. 65–70.
3. Fulton, W. and Harris, J. (1991) Representation theory. A first course, Graduate Texts in Mathematics, Vol. 129, Readings in Mathematics, Springer-Verlag, New York.
4. Hilbert, D. (1993) Theory of Algebraic Invariants, CUP.
5. Hirota, R. (1982) Bilinearization of soliton equations, J. Phys. Soc. Japan
51, pp. 323–331.