Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{UM_2009__17_2_a1, author = {Sm\'ykalov\'a, Radka}, title = {Z historie goniometrick\'ych funkc{\'\i} - {Ptolemaiovy} v\'ypo\v{c}ty}, journal = {U\v{c}itel matematiky}, pages = {66--80}, publisher = {mathdoc}, volume = {17}, number = {2}, year = {2009}, language = {cz}, url = {http://geodesic.mathdoc.fr/item/UM_2009__17_2_a1/} }
Smýkalová, Radka. Z historie goniometrických funkcí - Ptolemaiovy výpočty. Učitel matematiky, Tome 17 (2009) no. 2, pp. 66-80. http://geodesic.mathdoc.fr/item/UM_2009__17_2_a1/