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

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