(3GdTQja GdEOQjSj (B/ s - (3MOGO, NGdOs ((3OeTb (B:s (3OGQ GdcJGH GdYQHj,s, 1987)
Keywords: (3GdQMdGJ h GdSaQs; (3GdCSaGQs; (3GdQMGdIs