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On discontinuous groups operating on the product of the upper half planes. (English) Zbl 0218.10045

MSC:
11F55 Other groups and their modular and automorphic forms (several variables)
11F41 Automorphic forms on \(\mbox{GL}(2)\); Hilbert and Hilbert-Siegel modular groups and their modular and automorphic forms; Hilbert modular surfaces
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