KOCHUBEI , A. N. Varieties with invariant half-Rieman structure of almost product . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 7, p. 926–931, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8125. Acesso em: 6 dec. 2025.