XIE, L. Confirm that the imaginary number i is a closed field. Annals of Mathematics and Physics, [S. l.], v. 6, n. 1, p. 071–074, 2023. DOI: 10.17352/amp.000082. Disponível em: https://www.peertechzpublications.us/amp/article/view/AMP-6-182. Acesso em: 10 jan. 2025.