MathSciNet bibliographic data MR1767127 (2002d:57001) 57M12 (05C30) Shapiro, B.; Shapiro, M.; Vainshtein, A. Ramified coverings of \$S\sp 2\$$S\sp 2$ with one degenerate branch point and enumeration of edge-ordered graphs. Topics in singularity theory, 219–227, Amer. Math. Soc. Transl. Ser. 2, 180, Amer. Math. Soc., Providence, RI, 1997. Links to the journal or article are not yet available

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