Aserrar, Y. and Elqorachi, E. (2023) “Cosine and sine addition and subtraction law with an automorphism”, Annales Mathematicae Silesianae, 38(2), pp. 155–176. Available at: https://journals.us.edu.pl/index.php/AMSIL/article/view/16429 (Accessed: 5 December 2025).