(3Gdaf hGdGOH (B: s (3HMK LeGdi ai GdGfhGY hGdeOGQS GdGOHjI hGdafjI (B/ s - (3ejTGd YGUis ((3HjQhJ (B: s (3efThQGJ GdecJH GdJLGQi ddWHGYI hGdJhRjY , s, 1970)
Keywords: (3Gdaf hGdGOHs; (3GdGOH (B- (3JGQjN hfbOs