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-rw-r--r--content/know/concept/dirac-notation/index.pdc7
1 files changed, 7 insertions, 0 deletions
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.