ARSLANAGIĆ, Šefket. Důkazy jedné trigonometrické identity. Matematika–Fyzika–Informatika, [S. l.], v. 25, n. 2, p. 81–83, 2016. Disponível em: http://158.194.80.143/index.php/mfi/article/view/254. Acesso em: 13 led. 2025.