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Sándor Baran, Gyula Pap, Kinga Sikolya
Least squares estimator of the stability parameter ϱ:=∣α∣+∣β∣ for a spatial unilateral autoregressive process $X_{k,\ell}=αX_{k-1,\ell}+βX_{k,\ell-1}+\varepsilon_{k,\el…