(3ONGf GdchGfjf (B:s (3bUI bUjQI (B/s - (3Hgdhdj,eMeOGdYjO s ((3GdLRGFQ (B:s (3GdeDSSI GdhWfjI ddcJGH ,s, 1990)
Keywords: (3GdchGfjf s; (3ONGf s; (3bUI s; (3bUjQI s