(3BRehT RHGf aGQS (B/ s - (3KeQI, jOGddgs; (3jGOcQi, YHO GdegOjs ((3HjQhJ (B: s (3GdeJTGQjI GdKbGajI ddLeghQjI GdESdGejI GdEjQGfjI, s, 1991)
Keywords: (3GddZI GdaGQSjI(B. s; (3GdJYde(B. s