Geodesic
Some trigonometric relations in the Lorentzian plane
Kragujevac Journal of Mathematics, Tome 25 (2003) no. 1 
Emilija Nešović; Miroslava Petrović-Torgašev. Some trigonometric relations in the Lorentzian plane. Kragujevac Journal of Mathematics, Tome 25 (2003) no. 1. http://geodesic.mathdoc.fr/item/KJM_2003_25_1_a21/
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     author = {Emilija Ne\v{s}ovi\'c and Miroslava Petrovi\'c-Torga\v{s}ev},
     title = {Some trigonometric relations in the {Lorentzian} plane},
     journal = {Kragujevac Journal of Mathematics},
     pages = {219 - 225},
     year = {2003},
     volume = {25},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/KJM_2003_25_1_a21/}
}
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Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

SOME TRIGONOMETRIC RELATIONS IN THE LORENTZIAN PLANE