(3GddGYH h GddYHI (B: s (3YGde GdESJNHGQGJ GdCejQcjI aj EYJQGaGJ CMO QLGdGJg (B/ s - (3chHdGfO, eGjdRs ((3HjQhJ (B:s (3OGQ GdMeQGA ddWHGYI hGdfTQ,s, 1990)
Keywords: (3hcGdI GdESJNHGQGJ GdeQcRjIs; (3GdLhGSjSs