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Research partially supported by the Fonds National Suisse.
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Rudolph, L. Isolated critical points of mappings from R4 to R2 and a natural splitting of the Milnor number of a classical fibered link. Part I: Basic theory; examples. Commentarii Mathematici Helvetici 62, 630–645 (1987). https://doi.org/10.1007/BF02564467
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DOI: https://doi.org/10.1007/BF02564467