Visibility cells and T-convexity spaces
Compositio Mathematica, Tome 83 (1992) no. 3, pp. 251-257. 
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     author = {Bressan, Juan C. and Toranzos, Fausto A.},
     title = {Visibility cells and $T$-convexity spaces},
     journal = {Compositio Mathematica},
     pages = {251--257},
     publisher = {Kluwer Academic Publishers},
     volume = {83},
     number = {3},
     year = {1992},
     mrnumber = {1175940},
     zbl = {0756.52001},
     language = {en},
     url = {http://www.numdam.org/item/CM_1992__83_3_251_0/}
}
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Bressan, Juan C.; Toranzos, Fausto A. Visibility cells and $T$-convexity spaces. Compositio Mathematica, Tome 83 (1992) no. 3, pp. 251-257. http://www.numdam.org/item/CM_1992__83_3_251_0/

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