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/dirac-notation/index.pdc | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'content/know/concept/dirac-notation/index.pdc')

diff --git a/content/know/concept/dirac-notation/index.pdc b/content/know/concept/dirac-notation/index.pdc
index 999c90c..176f769 100644
--- a/content/know/concept/dirac-notation/index.pdc
+++ b/content/know/concept/dirac-notation/index.pdc
@@ -127,3 +127,10 @@ $$\begin{aligned}
     \\
     &= \braket{u}{f} \braket{g}{w}
 \end{aligned}$$
+
+
+
+## References
+1.  R. Shankar,
+    *Principles of quantum mechanics*, 2nd edition,
+    Springer.
-- 
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