Least-squares function approximation (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Least-squares function approximation" in English language version.

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Cornelius Lanczos (1988). Applied analysis (Reprint of 1956 Prentice–Hall ed.). Dover Publications. pp. 212–213. ISBN 0-486-65656-X.
Gerald B Folland (2009). "Equation 3.14". Fourier analysis and its application (Reprint of Wadsworth and Brooks/Cole 1992 ed.). American Mathematical Society Bookstore. p. 69. ISBN 978-0-8218-4790-9.
Folland, Gerald B (2009). Fourier Analysis and Its Applications. American Mathematical Society. p. 69. ISBN 978-0-8218-4790-9.
David J. Saville, Graham R. Wood (1991). "§2.5 Sum of squares". Statistical methods: the geometric approach (3rd ed.). Springer. p. 30. ISBN 0-387-97517-9.
Gerald B Folland (2009-01-13). "Equation 3.22". cited work. American Mathematical Soc. p. 77. ISBN 978-0-8218-4790-9.