Well centered spherical quadrangles.
Breda, Ana M. d'Azevedo ; Santos, Altino F.
Beiträge zur Algebra und Geometrie, Tome 44 (2003), p. 539-549 / Harvested from The Electronic Library of Mathematics
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Publié le : 2003-01-01
EUDML-ID : urn:eudml:doc:227627 
@article{01973847,
     title = {Well centered spherical quadrangles.},
     journal = {Beitr\"age zur Algebra und Geometrie},
     volume = {44},
     year = {2003},
     pages = {539-549},
     zbl = {1041.51007},
     language = {en},
     url = {http://dml.mathdoc.fr/item/01973847}
}

Breda, Ana M. d'Azevedo; Santos, Altino F. Well centered spherical quadrangles.. Beiträge zur Algebra und Geometrie, Tome 44 (2003) pp. 539-549. http://gdmltest.u-ga.fr/item/01973847/