(3efgL GdESdGe aj JQHjI GdCWaGd (B: s (3JUhQ ESdGej dOhQ GdMVGfI (B/ s - (3YhGO, LhOI eMeOs ((3GdbGgQI (B:s (3OGQ GdaVjdI ddfTQ hGdJhRjY,s, 1990)
Keywords: (3QjGV GdCWaGds; (3GdESdGes