Geodesic
A combinatorial approach to singularities of normal surfaces
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 5, Tome 2 (2003) no. 3, pp. 461-491

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In this paper we study generic coverings of ℂ 2 branched over a curve s.t. the total space is a normal analytic surface, in terms of a graph representing the monodromy of the covering, called monodromy graph. A complete description of the monodromy graphs and of the local fundamental groups is found in case the branch curve is {x n =y m } (with n≤m) and the degree of the cover is equal to n or n-1.

Classification : 32S25, 32S05 
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     author = {Manfredini, Sandro},
     title = {A combinatorial approach to singularities of normal surfaces},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {461--491},
     publisher = {Scuola normale superiore},
     volume = {Ser. 5, 2},
     number = {3},
     year = {2003},
     mrnumber = {2020857},
     zbl = {1170.32313},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ASNSP_2003_5_2_3_461_0/}
}
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Manfredini, Sandro. A combinatorial approach to singularities of normal surfaces. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 5, Tome 2 (2003) no. 3, pp. 461-491. http://geodesic.mathdoc.fr/item/ASNSP_2003_5_2_3_461_0/