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@@ -229,11 +229,11 @@ differential signal, with both driver outputs being loaded equally across the in
 
 \subsection{Inductive Wireless Power Transfer in Practice}
 
-Inductive WPT has been proposed in a large number of scenarios, each of which comese with a set of
-unique constraints. When WPT is used to charge an electric toothbrush, the implementation cost of the system is
-critical, while efficiency and total power output are of little concern. Mechanically, in an electric toothbrush's
-charging system, the position and spacing of the transmitter and receiver coils can easily be controlled down to
-millimeter precision.
+Inductive WPT has been proposed in a large number of scenarios\cite{zhangWirelessPowerTransfer2019}, each of which comes
+with a set of unique constraints. When WPT is used to charge an electric toothbrush, the implementation cost of the
+system is critical, while efficiency and total power output are of little concern. Mechanically, in an electric
+toothbrush's charging system, the position and spacing of the transmitter and receiver coils can easily be controlled
+down to millimeter precision.
 
 In contrast to this, wireless smartphone charging is a much more demanding application. Here, the total cost of the
 system is only secondary, but the receiver's form factor is critical, and total power output as well as efficiency