Counting connected components of the complement of the image of a codimension 1 map
Compositio Mathematica, Tome 93 (1994) no. 1, pp. 37-47. 
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     author = {Nu\~no Ballesteros, Juan J.},
     title = {Counting connected components of the complement of the image of a codimension $1$ map},
     journal = {Compositio Mathematica},
     pages = {37--47},
     publisher = {Kluwer Academic Publishers},
     volume = {93},
     number = {1},
     year = {1994},
     mrnumber = {1286797},
     zbl = {0833.55006},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1994__93_1_37_0/}
}
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Nuño Ballesteros, Juan J. Counting connected components of the complement of the image of a codimension $1$ map. Compositio Mathematica, Tome 93 (1994) no. 1, pp. 37-47. http://archive.numdam.org/item/CM_1994__93_1_37_0/

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