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4. Yu. V. Linnik, The Least-Squares Method and the Fundamentals of Mathematical-Statistical theory for the Treatment of Observations [in Russian], Fizmatgiz, Moscow (1962).
5. L. A. Bakhvalov and R. A. Prakhova, A Program System for Regression Analysis using an ODRA computer [in Russian], No. 1204. Submitted to State Fund of Algorithms and Programs, No. P002729 (1977).