On Ptolemy's theorem.
Shisha, Oved
International Journal of Mathematics and Mathematical Sciences, Tome 14 (1991), / Harvested from The Electronic Library of Mathematics
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Publié le : 1991-01-01
DOI : https://doi.org/10.1155/S0161171291000509
EUDML-ID : urn:eudml:doc:46703 
@article{00011599,
     title = {On Ptolemy's theorem.},
     journal = {International Journal of Mathematics and Mathematical Sciences},
     volume = {14},
     year = {1991},
     doi = {10.1155/S0161171291000509},
     zbl = {0748.30009},
     language = {en},
     url = {http://dml.mathdoc.fr/item/00011599}
}

Shisha, Oved. On Ptolemy's theorem.. International Journal of Mathematics and Mathematical Sciences, Tome 14 (1991) . doi : 10.1155/S0161171291000509. http://gdmltest.u-ga.fr/item/00011599/