(3GdefJNH ef GeKGd GdYQH eKd hbUI heVQH (B/ s - (3YHOGdSdGe GdYTQis ((3GdbGgQI (B: s (3fgVI eUQ ddWHGYI hGdfTQ hGdJhRjY , s, 1990)
Keywords: (3GdGOH GdYQHis; (3GdGeKGd GdYQHjIs; (3GdGgGLi hGdacGgGJs; (3GdGeKGd GdYGejIs