(3GdeOGQS aj HjJ GdebOS (B: s (3aj GdYUQjf GdCjhHj hGdeedhcj hOhQgG aj GdMQcI GdacQjI (B/ s ((3YqeGf (B: s (3ecJHI GdCbUi , s, 1981)
Keywords: (3GdJYdje aj GdbOS $1 (3JGQjN; GdeOGQS GdESdGejI $1 (3GdYUhQ GdhSWi; GdMQcI GdacQjI aj GdeTQb GdESdGejs