【题 名】：Stationarity and invertibility regions for low-order STARMA models.
         【作 者】： PFEIFER, P. E. and DEUTSCH, S. J.
         【期刊、会议、单位名称】：Industrial and Systems Engineering Report Series No. J-79-03,
         【年, 卷(期), 起止页码】：Industrial and Systems Engineering Report Series No. J-79-03, 1979
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