(3YdGbI GdWad HGdhSGFd GdeWHhYI h GdGdcJQhfjI (B/s - (3GdTGd , EfTQGM s ((3GdbGgQI (B:s (3OGQ GdacQ GdYQHj ,s, 1987)
Keywords: (3GdGdcJQhfjI s; (3GdWads; (3GdhSGFd s; (3GdeWHhYI s