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This paper was supported partly by the U.S. National Science Foundation Grant P-13967 and partly by the Mathematical Institute of the University at Bonn, Germany.
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Cohn, H. Some explicit resolutions of modular cusp singularities. Math. Ann. 198, 123–130 (1972). https://doi.org/10.1007/BF01432282
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DOI: https://doi.org/10.1007/BF01432282