Banaru, M. “ON SIX-DIMENSIONAL HERMITIAN SUBMANIFOLDS OF CAYLEY ALGEBRA SATISFYING THE $G$-COSYMPLECTIC HYPERSURFACES AXIOM”. Ann. Sofia Univ. Fac. Math. And Inf., vol. 94, Dec. 2002, pp. 91-96, https://ftl5.uni-sofia.bg./index.php/fmi/article/view/193.