00307nam a2200121Ia 4500082001900000100001800019245008300037260000900120300000600129490001500135490003000150500000500180  a330.183 F533b  aFisher, F. M.  aOn the cost of approximate specification in simultaneous equation estimationb  c1961  a   vApril 1961  aEconometrica, v.29, no.2   a