1. M. Toda, “Vibration of chain with nonlinear interaction,” J. Phys. Soc. Japan, 22, 431–436 (1967).
2. Mathematics and its Applications (Japanese Series);M. Toda,1989
3. E. Witten, “Two-dimensional gravity and intersection theory on moduli space,” in: Surveys in Differential Geometry, (C. C. Hsiung, S. T. Yau, and H. Blaine Lawson, Jr., eds., Harvard University, Cambridge, MA, USA, April 27–29, 1990), Lehigh Univ., Bethlehem, PA (1991), pp. 243–310.
4. Lecture Notes in Mathematics;B. A. Dubrovin,1996
5. Advanced Studies in Pure Mathematics;K. Ueno,1984