(3EYUGQ GdNdjL (B: s (3QjGM GdTQb JgH Ydi eSJbHd GdYGde (B: (3OQGSI JMdjdjI aj MJejI GdefGRdI GdcHQi (B/ s - (3YcfGf, CSGegs ((3GdRQbGA (B:s (3GdeDda,s, 1990)
Keywords: (3GdHdOGf GdYQHjIs; (3GdCMhGd GdSjGSjIs; (3MQH GdNdjL (B1991s