(3GdKhQI GdJcfhdhLjI hhSGFd GdEJUGd GdYQHjI (B/s ((3JhfS (B:s (3defXeI GdYQHjI ddJQHjI h GdKbGaI h GdYdhe ,s, 1991)
Keywords: (3GdKhQI GdJcfhdhLjI s; (3hSGFd GdEJUGds