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Supported by NSF grant GP 32843 at Columbia University and by an NSF-CNRS exchange fellowship at the I.H.E.S.
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Pinkham, H. Normal surface singularities withC* action. Math. Ann. 227, 183–193 (1977). https://doi.org/10.1007/BF01350195
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DOI: https://doi.org/10.1007/BF01350195