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diff --git a/doc/thesis/chapters/theory.tex b/doc/thesis/chapters/theory.tex
index c73f94d..dfea46d 100644
--- a/doc/thesis/chapters/theory.tex
+++ b/doc/thesis/chapters/theory.tex
@@ -69,7 +69,7 @@ Before explaining how the two carrier signals are generated, we first need to di
= 0, \text{ and } \label{eqn:orthogonal-condition} \\
\langle \phi_k, \phi_k \rangle
&= \int_T \phi_k \phi_k^* \,dt = 1,
- \text{ where } k \text{ is either } i \text{ or } q. \label{eqn:orthonormal-condition}
+ \text{ where } k \text{ is either } i \text{ or } q \,\text{\cite{Gallager}}. \label{eqn:orthonormal-condition}
\end{align}
\end{subequations}
Provided these rather abstract conditions, let's define a new signal