(3GcPhHI GdGSJYeGQ GdeUQi ddShOGf (B: (3QDjI JGQjNjI (B(13) / s - (3YHOGdYXje QeVGfs ([S.N] : (3GdgjFI GdeUQjI GdYGeI ddcJGH , s, 1988)
Keywords: (3eUQs; (3JGQjNs; (3GdShOGfs; (3GdYdGbGJ GdSjGSjIs; (3KhQI (B23 (3jhdjh (B1952s; (3GdGMJdGd GdHQjWGfis