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\documentclass[reqno]{amsart}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage[T1]{fontenc}
\usepackage{ae}
\usepackage{hyperref}


\numberwithin{equation}{subsection}

\begin{document}

\section{My section title}

Some text.

\subsection{My first subsection}
\label{ss:first}

\begin{equation}
\label{eq:A}
p^{\prime\prime} + \dfrac{S^\prime}{S}p^\prime +k^2p = 0
\end{equation}

Let's refer to equations~\ref{eqs:C} in 
subsection\ref{ss:second}.

\begin{equation}
\label{eq:B}
g(x)=const \times f(x) \int^{x} \dfrac{d\xi}{S(\xi)f^{2}(\xi)} .
\end{equation}

Now I'll force a new page so the hyper-references will bridge a page
boundary.
\newpage

\subsection{My second subsection}
\label{ss:second}
Now some subequations.

\begin{subequations}
\label{eqs:C}
\begin{align}
p^\prime& = -Z(x)U \label{eq:pC} \\
U^\prime & = -Y(x)p \label{eq:UC}
\end{align}
\end{subequations}

These are related to equation~\ref{eq:A} in subsection~\ref{ss:first}.

{%
\begin{subequations}
\label{eqs:D}
\begin{align}
p^\prime& = -j \omega {\dfrac{\rho}{S(x)}}U
 = -jk {\dfrac{\rho c}{S(x)}}U \label{eq:pD} \\
U^\prime & = -j \omega {\dfrac{S(x)}{\rho c^{2}}}p
 = -jk {\dfrac{S(x)}{\rho c}}p \label{eq:UD}
\end{align}
\end{subequations}
}

\end{document}