(3GdceHjhJQ ddUZGQ GdeSJhi GdGhd(B: (3GSGSjGJ dZI GdHjSc (B/ s - (3YGWa Mdjes ((3GdbGgQI (B: s (3TQcI QMjech , s, 1987)
Keywords: (3JYdje GdGWaGds; (3GdHjScs; (3HQGeL GdMGSHGJ GdGdcJQhfjIs