(3GdeSQM GdTYQi YfO UdGM YHO GdUHhQ (B/ s - (3KQjG GdYSjdis ((3GdbGgQI (B: s (3GdgjFI GdeUQjI GdYGeI ddcJGH , s, 1990)
Keywords: (3GdGOH GdYQHis; (3UdGM YHOGdUHhQs; (3JGQjN hfbOs; (3GdeSQMjGJ GdYQHjIs