From 9657833b115c8a61509295d2296c6f89e81fd219 Mon Sep 17 00:00:00 2001
From: Prefetch
Date: Fri, 28 May 2021 15:27:37 +0200
Subject: Improve citations

---
 content/know/concept/sturm-liouville-theory/index.pdc | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'content/know/concept/sturm-liouville-theory/index.pdc')

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+    unpublished.
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