İŞCAN, M.; ÖZKAN, M. On Four-Dimensional Paracomplex Structures with Norden Metrics. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 67, n. 1, p. 32–41, 2015. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1961. Acesso em: 5 dec. 2025.