50 (3hUjI ef hUGjG GdQShd Udi Gddg hYdjg hSde ddfSGA (B/s - (3EHQGgje, eLOj GdSjOs ((3GdbGgQI (B:s (3ecJHI GdbQBf,s, 1994)
Keywords: (3GdhYX hGdEQTGOs; (3GdhUGjG (B((3abg ESdGej(B)s