(3GaQjbjGJ(B: (3OQGSGJ ai GdeZQH GdYQHi hGdShOGf GdZQHi (B/ s - (3fbhdG RjGOIs ([S.N] : (3QjGV GdQjS ddcJH hGdfTQ , s, 1991)
Keywords: (3JGQjNs; (3GdGMhGd GdSjGSjIs; (3GdShOGfs; (3GaQjbjGs; (3GdeZQH GdYQHis; (3GdGSdGe hGdSjGSIs