00356    a2200097   4500001001000000005001700010008004100027245010000068100002300168773006700191ART_1207720260410161903.0260409a                                 10aGains in efficiency from joint estimation of systems of autoregressive-moving average processes1 aNelson, Charles R.0 tJournal of econometricsg- Vol. 4, Nº 4 (nov. 1976)wREV11720