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diff --git a/content/know/concept/sturm-liouville-theory/index.pdc b/content/know/concept/sturm-liouville-theory/index.pdc index 7ccd625..66a4a82 100644 --- a/content/know/concept/sturm-liouville-theory/index.pdc +++ b/content/know/concept/sturm-liouville-theory/index.pdc @@ -344,3 +344,9 @@ $$\begin{aligned} } \end{aligned}$$ + + +## References +1. O. Bang, + *Applied mathematics for physicists: lecture notes*, 2019, + unpublished. |