00261nam a2200109Ia 4500020001800000082002100018100001600039245002400055250001200079260004500091650001500136  a9780070663572  a330.015195 JOH/E  aJohnston, J 0aEconometric Methods  a3RD ED.  bMcgraw-Hill Book CompanyaAucklandc1991  aEconomists