1. Leznov, A. N. and Saveliev, M. V.: Nonlinear equations and graded Lie algebras, J. Sov. Math. 36 (1987), 699?721.
2. Leznov, A. N. and Saveliev, M. V.: Group Methods for Integration of Nonlinear Dynamical Systems, Nauka, Moscow, 1985 (in Russian). To be publ. by Birkhäuser-Verlag.
3. Bogolubov, N. N., Logunov, A. A., Oksak, A. I., and Todorov, I. T.: General Principles of Quantum Field Theory, Nauka, Moscow, 1987 (in Russian) To be publ. by Kluwer (1989).
4. Leznov, A. N. and Saveliev, M. V.: Two-dimensional exactly and completely integrable systems (Monopoles, instantons, dual models, relativistic strings, Lund-Regge model, generalized Toda lattice, etc.), Commun. Math. Phys. 89 (1983), 59?75.
5. Manin, Yu. I. (ed.): Geometrical Ideas in Physics, Mir, Moscow, 1983 (in Russian).