(3LGeY GdOQhS GdYQHjI (B: s (3ehShYI aj KdGKI CLRGA (B/ s - (3GdZdGjfj, GdTjN eUWais ((3HjQhJ (B:s (3GdecJHI GdYUQjI,s, 1987)
Keywords: (3GddZI GdYQHjIs; (3GdfMh h GdUQas