KALIMUTHU, S. A Degenerate Spherical Triangle. Annals of Mathematics and Physics, [S. l.], p. 117–122, 2026. DOI: 10.17352/amp.000188. Disponível em: https://www.mathematicsgroup.com/amp/article/view/AMP-9-288. Acesso em: 1 jul. 2026.