(3ehShYI Yde GdGKGQ(B/s - (3OGfjGd,cdjfs; (3jhSa,djhfs ((3HZOGO(B[(3GdYQGb(B]:s (3OGFQI GdGYdGe hRGQI GdKbGaI hGdGYdGe,s, 1990)
Keywords: (3GdGKGQs