(3JGQjN GdOhdI GdGSdGejI HBSjG hMVGQJgG (B: s (3THg GdbGQI GdgfOjI hGdHGcSJGfjI hHfLGdGOT (B- (3GjQGf (B- (3HdGO eGhQGA GdfgQ (B( (3HNGQi GdcHQi Gh GdJQcSJGf (B- (3GaZGfSJGf (B- (3JQcjG (B) / s - (3GMeO eMehO GdSGOGJis ((3GdbGgQI (B: s (3ecJHI fgVI GdTQb , s, 1987)
Keywords: (3GdGSdGe s -- (3JGQjNs; (3GaZGfSJGfs -- (3JGQjNs; (3GdgfO s -- (3JGQjNs; (3JQcjGs -- (3JGQjNs