Happ, H. H. (1980). Piecewise methods and applications to power systems. Wiley.
Chicago-viite (17. p.)Happ, H. H. Piecewise Methods and Applications to Power Systems. New York: Wiley, 1980.
MLA-viite (9. p.)Happ, H. H. Piecewise Methods and Applications to Power Systems. Wiley, 1980.
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