Antiholomorphic curvature operator in the almost Hermitian geometry. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 88, p. 255–263, 1996. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/384. Acesso em: 11 jan. 2026.