(3GdSMQ aj GdJhGQg (B: (3h GdYgO GdbOje (B/ s - (3ebGQ, Tajbs ((3dfOf (B:s (3QjGV GdQjS ddcJH h GdfTQ,s, 1990)
Keywords: (3GdYgO GdbOjes; (3GdcJGH GdebOSs; (3GdSMQs