(3TYQGA eYGUQhf (B/ s - (3ahRi SYO YjSis ((3GdbGgQI (B: s (3OGQ GdeYQaI GdLGeYjI , s, 1990)
Keywords: (3GdTYQ GdYQHis; (3GdYUQ GdMOjKs; (3GdTYQGA GdYQHs