VIDEV, V. Antiholomorphic curvature operator in the almost Hermitian geometry. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 88, p. 255–263, 1996. Disponível em: https://admin.uni-sofia.bg/index.php/fmi/article/view/384. Acesso em: 15 jan. 2025.