(3UaI UdGI GdfHj (B: s (3ef GdJcHjQ Gdi GdJSdje cCfc KQGgG (B/ s - (3GdGdHGfj , eMeO fGUQ GdOjf s ((3HZOGO (B: s (3ecJHI eQhI , s, 1990)
Keywords: (3GdUdGI s