Critical sets in 3-space
Publications Mathématiques de l'IHÉS, Tome 77 (1993), pp. 5-61 
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     author = {Grayson, Matthew and Pugh, Charles},
     title = {Critical sets in 3-space},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {5--61},
     year = {1993},
     publisher = {Institut des Hautes Etudes Scientifiques},
     volume = {77},
     mrnumber = {94k:57049},
     zbl = {0796.58012},
     language = {en},
     url = {https://www.numdam.org/item/PMIHES_1993__77__5_0/}
}
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Grayson, Matthew; Pugh, Charles. Critical sets in 3-space. Publications Mathématiques de l'IHÉS, Tome 77 (1993), pp. 5-61. https://www.numdam.org/item/PMIHES_1993__77__5_0/

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