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Research partially supported by NSF Grant NSF MCS 77-07660
Research partially supported by NSF Grant NSF MCS 76-08230
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Ash, A., Rudolph, L. The modular symbol and continued fractions in higher dimensions. Invent Math 55, 241–250 (1979). https://doi.org/10.1007/BF01406842
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DOI: https://doi.org/10.1007/BF01406842