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Relations between quadratic differentials. (English) Zbl 0233.32020
Advances Theory Riemann Surfaces, Proc. 1969 Stony Brook Conf., 141-156 (1971).

##### MSC:
 30F30 Differentials on Riemann surfaces 32C38 Sheaves of differential operators and their modules, $$D$$-modules 14H42 Theta functions and curves; Schottky problem