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+++ b/content/know/concept/bell-state/index.pdc
@@ -91,3 +91,9 @@ then $B$ instantly also collapses into $\ket{0}$, never $\ket{1}$,
even if it was not measured.
This was a specific example for $\ket*{\Phi^{+}}$,
but analogous results can be found for the other Bell states.
+
+
+## References
+1. J.B. Brask,
+ *Quantum information: lecture notes*,
+ 2021, unpublished.