(3GddUGf GdZHjGf (B/ s - (3HGjQf, Ofs; (3ZGdj, hLOj QRbs ((3HjQhJ (B:s (3ecJHI dHfGf,s, 1987)
Keywords: (3GdbUU GdYQHjIs; (3GdCOH GdYQHjs; (3COH GdCWaGds; (3GWaGd eQMdg eJhSWg(B(6-9)(3SfhGJs