Non-trivial projections of the trivial knot
Algorithmique, topologie et géométrie algébriques - Sévilla,1987, Toulouse 1988, Astérisque, no. 192 (1990), pp. 7-10 
@incollection{AST_1990__192__7_0,
     author = {Ochiai, Mitsuyuki},
     title = {Non-trivial projections of the trivial knot},
     booktitle = {Algorithmique, topologie et g\'eom\'etrie alg\'ebriques - S\'evilla,1987, Toulouse 1988},
     editor = {Hayat-Legrand Claude and Sergeraert Francis},
     series = {Ast\'erisque},
     pages = {7--10},
     year = {1990},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {192},
     language = {en},
     url = {https://www.numdam.org/item/AST_1990__192__7_0/}
}
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Ochiai, Mitsuyuki. Non-trivial projections of the trivial knot, dans Algorithmique, topologie et géométrie algébriques - Sévilla,1987, Toulouse 1988, Astérisque, no. 192 (1990), pp. 7-10. https://www.numdam.org/item/AST_1990__192__7_0/

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