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-rw-r--r--content/know/concept/dirac-delta-function/index.pdc7
1 files changed, 7 insertions, 0 deletions
diff --git a/content/know/concept/dirac-delta-function/index.pdc b/content/know/concept/dirac-delta-function/index.pdc
index 97704d7..76b6e97 100644
--- a/content/know/concept/dirac-delta-function/index.pdc
+++ b/content/know/concept/dirac-delta-function/index.pdc
@@ -109,3 +109,10 @@ $$\begin{aligned}
\int f(\xi) \: \dv[n]{\delta(x - \xi)}{x} \dd{\xi} = \dv[n]{f(x)}{x}
}
\end{aligned}$$
+
+
+
+## References
+1. O. Bang,
+ *Applied mathematics for physicists: lecture notes*, 2019,
+ unpublished.