xaphirecipes

\usepackage{rotating}
\begin{sidewaysfigure}[htbp]
\begin{center}
\subfigure[3D plot]{\includegraphics[width=0.5\textwidth]{img/5.0-app/feedback-control/xyz}}%
\subfigure[x-y plot]{\includegraphics[width=0.5\textwidth]{img/5.0-app/feedback-control/xy}}\\
\subfigure[x-z plot]{\includegraphics[width=0.5\textwidth]{img/5.0-app/feedback-control/xz}}%
\subfigure[y-z plot]{\includegraphics[width=0.5\textwidth]{img/5.0-app/feedback-control/yz}}\\
\caption{\textbf{Trajectories of the feedback control system.} These are the trajectories of the system in formula \vref{feedback-control-ODE-5.0} at the initial state $(0.1,0.1,0)$. For $a < 1$ (blue) the equilibrium is unstable and a stable limit cycle surrounds it. In this case the dynamics of the periodic orbit is much more complicated than the Hopf normal form. For $a > 1$ (red) the equilibrium is stable.}
\label{feedback-control-allplot-5.0}
\end{center}
\end{sidewaysfigure}