Silva Ribeiro, M. F., L. Nery de Oliveira, and T. F. da Silva. “Poincar´e Duality and the Existence of Exotic Structures on N-Spheres”. Latin American Journal of Mathematics, vol. 2, no. 01, Aug. 2023, pp. 58-98, doi:10.14244/lajm.v2i01.25.