Topological and smooth unitals.
Immervoll, Stefan
Advances in Geometry, Tome 1 (2001), p. 333-344 / Harvested from The Electronic Library of Mathematics
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Publié le : 2001-01-01
DOI : https://doi.org/10.1515/advg.2001.020
EUDML-ID : urn:eudml:doc:122145 
@article{01686126,
     title = {Topological and smooth unitals.},
     journal = {Advances in Geometry},
     volume = {1},
     year = {2001},
     pages = {333-344},
     doi = {10.1515/advg.2001.020},
     zbl = {0997.51003},
     language = {en},
     url = {http://dml.mathdoc.fr/item/01686126}
}

Immervoll, Stefan. Topological and smooth unitals.. Advances in Geometry, Tome 1 (2001) pp. 333-344. doi : 10.1515/advg.2001.020. http://gdmltest.u-ga.fr/item/01686126/