(3GdYbd hGdLSe (B: s (3OQGSI faSjI aSjhdhLjI (B/ s - (3HfSf , gQHQJ s; (3Ydj , eMeO LGHQs ((3HZOGO (B: s (3OGQ GdeCehf ddJQLeI hGdfTQ , s, 1989)
Keywords: (3GdWH GdfaSj s