1. Arbarello, E., De Concini, C.: On a set of equations characterizing Riemann matrices. Ann. Math.120, 119?140 (1984)
2. Burchnall, J.L., Chaundy, T.W.: Commutative ordinary differential operators. Proc. Lond. Math. Soc.21, 420?440 (1922); Proc. R. Soc. Lond. (A)118, 557?583 (1928); Ibid. Proc. R. Soc. Lond. (A)134, 471?485 (1931)
3. Date, E., Jimbo, M., Kashiwara, M., Miwa, T.: Transformation groups for soliton equations. In: Proceedings RIMS Symp. Nonlinear integrable systems-classical theory and quantum theory (Kyoto 1981) pp. 39?119. Singapore: World Scientific 1983
4. Deligne, P., Mumford, D.: The irreducibility of the space of curves of given genus. IHES Publ. Math.36, 75?109 (1969)
5. D'Souza, C.: Compactification of generalized Jacobians. Proc. Indian Acad. Sci. (A)88, (5) 419?457 (1979)