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== External links ==
*[http://tutorial.math.lamar.edu/classes/de/VariationofParameters.aspx Online Notes / Proof] by Paul Dawkins, [[Lamar University]].
*[http://planetmath.org/encyclopedia/VariationOfParameters.html PlanetMath page] {{Webarchive|url=https://web.archive.org/web/20091212052413/http://planetmath.org/encyclopedia/VariationOfParameters.html |date=2009-12-12 }}.
*[https://projecteuclid.org/download/pdf_1/euclid.mjms/1316092232 A NOTE ON LAGRANGE’S METHOD OF VARIATION OF PARAMETERS]
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