(3TQM GdbGfhf GdOSJhQj (B: s ((3GdeHGOF GdYGeI hGdOSJhQ GdeUQj(B) / s - (3cGed, eUWais ([(3ecGf GdfTQ ZjQ eMOO(B] : s [(3GdfGTQ ZjQ eMOO(B](3, s, 1950)
Keywords: (3GdbGfhf GdOSJhQjs -- (3eUQs