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2. Montgomery, D.C., Jennings, Ch.L., Kulahci, M.: Introduction to Time Series Analysis and Forecasting. NY, Wiley. 2008.
ISBN: 978-0-471-65397-4 .
3. Mendenhall, W., Sincich, T.: A Second Course in Statistics: Regression Analysis. Sixt Edition. Perason Education, New Jersey, 2003.
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4. Draper, N.R., Smith, H.: Applied Regression Analysis. 3rd Edition. NY, Wiley. 1998.
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