A Regular Visit? The Diplomatic Trip of Agostino Casaroli to East-Berlin and its Reception in East-Berlin and the Vatican - Cerny-Werner, Roland (. The @Vatican "Ostpolitik" 1958-1978. - First edition. - Roma : Viella, December 2015. - 271 Seiten. - ISBN 978-88-6728-582-2, 2015)