ON SIX-DIMENSIONAL HERMITIAN SUBMANIFOLDS OF CAYLEY ALGEBRA SATISFYING THE $G$-COSYMPLECTIC HYPERSURFACES AXIOM. (2002). Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, 94, 91-96. https://annual.uni-sofia.bg/index.php/fmi/article/view/193