Focal sets of submanifolds.
Cecil, Thomas E. ; Ryan, Patrick J.
Pacific J. Math., Tome 79 (1978) no. 2, p. 27-39 / Harvested from Project Euclid
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Publié le : 1978-05-14
Classification:  53C40 
@article{1102806296,
     author = {Cecil, Thomas E. and Ryan, Patrick J.},
     title = {Focal sets of submanifolds.},
     journal = {Pacific J. Math.},
     volume = {79},
     number = {2},
     year = {1978},
     pages = { 27-39},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1102806296}
}

Cecil, Thomas E.; Ryan, Patrick J. Focal sets of submanifolds.. Pacific J. Math., Tome 79 (1978) no. 2, pp.  27-39. http://gdmltest.u-ga.fr/item/1102806296/