(3GdEfJgGc GdLfSj ddRhLI (B: s (3OQGSI aj ShSjhdhLjG GdYfa GdCSQj (B/ s - (3GdSeQj, YOdjs ((3GdbGgQI (B: s (3OGQ GdeYQaI GdLGeYjI, s, 1999)
Keywords: (3GdCfhKI(B. s; (3Yde GdELJeGY(B. s; (3GdCSQI(B. s; (3SjchdhLjI GdLfS(B. s; (3GdJQHjI GdLfSjI(B. s