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The first author was supported in part by U.S. NSF grant SD GU 3171.
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Hammond, W.F., Hirzebruch, F. L-series, modular imbeddings, and signatures. Math. Ann. 204, 263–270 (1973). https://doi.org/10.1007/BF01354577
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DOI: https://doi.org/10.1007/BF01354577