(3GdNOeI GdELJeGYjI aj eLGd GdYed (B/ s - (3HOhj, CMeO Rcjs ((3GdEScfOQjI (B: s (3OGQ GdLGeYGJ GdeUQjI, s, 1990)
Keywords: (3GdNOeGJ GdELJeGYjI(B. s; (3GdNOeI GdELJeGYjI(B. s; (3GdQYGjIGdELJeGYjIGdYed(B. s; (3GdYeGd(B. s