Focal Sets, Taut Embeddings and the Cyclides of Dupin.
Cecil, Thomas E. ; Ryan, Patrick J.
Mathematische Annalen, Tome 237 (1978), p. 177-190 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1978-01-01
EUDML-ID : urn:eudml:doc:163167 
@article{GDZPPN002316153,
     title = {Focal Sets, Taut Embeddings and the Cyclides of Dupin.},
     journal = {Mathematische Annalen},
     volume = {237},
     year = {1978},
     pages = {177-190},
     zbl = {0365.53004},
     url = {http://dml.mathdoc.fr/item/GDZPPN002316153}
}

Cecil, Thomas E.; Ryan, Patrick J. Focal Sets, Taut Embeddings and the Cyclides of Dupin.. Mathematische Annalen, Tome 237 (1978) pp. 177-190. http://gdmltest.u-ga.fr/item/GDZPPN002316153/