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diff --git a/content/know/concept/dispersive-broadening/index.pdc b/content/know/concept/dispersive-broadening/index.pdc
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@@ -93,3 +93,10 @@ Of great importance is the sign of $\beta_2$:
in the **anomalous dispersion regime** ($\beta_2 < 0$),
lower frequencies travel more slowly than higher ones,
and vice versa in the **normal dispersion regime** ($\beta_2 > 0$).
+
+
+
+## References
+1. O. Bang,
+ *Numerical methods in photonics: lecture notes*, 2019,
+ unpublished.