(3LGeYI GdGScfOQjI ai GdYUQ GdGZQjbi GdQheGfi (B: s (3hGdfbd YfgG hJGKQ GdYbd GdYQHi HYdhegG (B/ s - (3GHQGgje LeYIs ((3GdbGgQI (B: s (3GdeWHYI GdYGdejI , s, 1981)
Keywords: (3adSaIs; (3GdYQHs; (3GdJGQjNs; (3GdGScfOQjIs; (3GdMVGQI GdgjdjfjIs; (3ecJHI GdGScfOQjI GdLOjOIs