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Supported by the Schweiz. Nationalfonds zur Förderung wissenschaftlicher Forschung
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Schaller, P.S. The modular torus has maximal length spectrum. Geometric and Functional Analysis 6, 1057–1073 (1996). https://doi.org/10.1007/BF02246996
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DOI: https://doi.org/10.1007/BF02246996