ON THE GRAY-HERVELLA CLASSES OF AH-STRUCTURES ON SIX-DIMENSIONAL SUBMANIFOLDS OF CAYLEY ALGEBRA. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 95, p. 125–131, 2003. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/182. Acesso em: 14 dec. 2025.