00281nam a2200109Ia 4500082001900000100002100019245006900040300001300109490001400122490003000136500000500166  a330.183 H112b  aHaavelmo, Trygve  aStatistical implications of a system of simultaneous equationsb  app. 1-12  vJan. 1943  aEconometrica, v.11, no.1   a