1. B. Riemann, Oeuvres Mathématiques, Blanchard, Paris, 1968, pp. 353–363.
2. G. V. Chudnovsky, C. R. Acad. Sci. Paris, 288 (1979) A607–A609.
3. G. V. Chudnovsky, C. R. Acad. Sci. Paris, 288 (1979) A965–A967.
4. Ch. Hermite, C. R. Acad. Sci. Paris, 77 (1873) 18–24, 74-79, 226.
5. G. V. Chudnovsky, Cargese Lectures in Bifurcation Phenomena in Mathematical Physics and Related Topics, D. Reidel, Boston, 1980, 448–510.