The synchrotron radiation source PETRA III and its future...
a e-mail: christian.schroer@desy.de (corresponding author) b e-mail: hans.christian.wille@desy.de c e-mail: oliver.seeck@desy.de d e-mail: kai.bagschik@desy.de e e-mail: horst.schulte-schrepping@desy.de f e-mail