(3QSGFd GdLGMX (B/ s - (3GdLGMX (B: (3GHhYKeGf YeQh Hf HMQ eMHhHs; (3YHOGdSdGe gGQhfs; (3YHO G(B. (3egfGs ((3HjQhJ (B: s (3OGQ GdLjd , s, 1991)
Keywords: (3GdGOH GdYQHis; (3GdLGMXjIs