Bibliography

1

J. Weiss, J. Math. Phys. 25 (1984) 13.

2

E. Hille, Ordinary Differential Equations in the Complex Plane, Wiley, New York, 1976.

3

J. Weiss, J. Math. Phys. 24 (1983) 1405.

4

B. Fuchssteiner and A. S. Fokas, Physica D4 (1981) 47.

5

A. S. Fokas and R. L. Anderson, J. Math. Phys. 23 (1982) 1066.

6

B. A. Kupershmidt and G. Wilson, Invent. Math. 62 (1981) 403.

7

H. Yoshida, Celestial Mech. 81 (1983) 363, 381.

8

L. Infeld and T. Hull, Rev. Mod. Phys. 23 (1951) 21.

9

J. L. Burchnall and T. W. Chaundy, Proc. R. Soc. Lond. A118 (1928) 557.

10

P. D. Lax, Commun. Pure Appl. Math. 28 (1975) 141.

11

I. M. Gelfand and L. A. Dikii, Integrable Systems (S. P. Novikov, ed.), Cambridge University Press, London, 1981), p. 13; B. A. Dubrovin, V. B. Matveer, and S. P. Novikov, ibid., p. 53.