RAMM, A. G. Symmetry problem 1. JOURNAL OF ADVANCES IN MATHEMATICS, [S. l.], v. 15, p. 8093–8097, 2018. DOI: 10.24297/jam.v15i0.7945. Disponível em: https://www.rajpub.com/index.php/jam/article/view/7945. Acesso em: 6 jun. 2025.