(3LfhH GdShOGf GdJeGOi ai fbV GdehGKjb hGdYghO (B/ s - (3GdjQ(B, (3GHjds; (3HTjQ eMeO SYjO (B((3eJQLe(B)s ([S.N] : (3ejOdGjJ , s, 1992)
Keywords: (3JGQjNs; (3GdGMhGd GdSjGSjIs; (3GdShOGfs; (3LfhH GdShOGfs