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What is the original paper in which Erich Hecke had first introduced the Hecke operators?
Über Modulfunktionen und die Dirichletschen Reihen mit Eulerscher Produktentwicklung. I, Math. Ann. 114 (1937), 1-28; II, ibid., 316-351. These two papers are available here and here.
Required, but never shown