“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 (December): 91-96. https://annual.uni-sofia.bg/index.php/fmi/article/view/193.