(3Yf WQjb GdNOGYs - (3ajcJhQ GhSJQhaScj (B. (3cdjQ ghj JQLeg gTGe YHO Gddg , eGgQ GdcjGdj , LhQL NhQs ((3HjQhJs (3GdeDSSI GdYQHjI ddOQGSGJ hGdfTQ (B1990s, 1990)
Keywords: (3GdGSJNHGQGJ ESQGFjd GdehSGOs