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/kramers-kronig-relations/index.pdc | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'content/know/concept/kramers-kronig-relations')

diff --git a/content/know/concept/kramers-kronig-relations/index.pdc b/content/know/concept/kramers-kronig-relations/index.pdc
index 1d29f96..9b67d60 100644
--- a/content/know/concept/kramers-kronig-relations/index.pdc
+++ b/content/know/concept/kramers-kronig-relations/index.pdc
@@ -132,3 +132,10 @@ $$\begin{aligned}
 \end{aligned}$$
 
 To reiterate: this version is only valid if $\chi(t)$ is real in the time domain.
+
+
+
+## References
+1.  M. Wubs,
+    *Optical properties of solids: Kramers-Kronig relations*, 2013,
+    unpublished.
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