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Bernard Fingleton, Julie Le Gallo, Finite Sample Properties of Estimators of Spatial Models with Autoregressive, or Moving Average, Disturbances and System Feedback, Annales d'Économie et de Statistique, No. 87/88, Spatial Econometrics, Innovative Networks and Growth (Jul. - Dec., 2007), pp. 39-62
Fingleton et al. (Mon,) studied this question.