Eberhard Zeidler ; translated by Author and by Leo F. Boront. Eberhard Zeidler ; translated by the author and by Leo F. Boront. Eberhard Zeidler ; translated by Leo F. Boront. Eberhard Zeidler ; translated by Leo F. Boron. Eberhard Zeidler ; translated by Juergen Quandt. Eberhard Zeidler ; translated by Peter R. Wadsack.