Dissertation in the History of Art presented to the Faculties of the University of Pennsylvania, Philadelphia 2005.: Bruno Eble, "Gerhard Richter : la surface du regard", L'Harmattan, 2006, 237 p. ISBN 978-2-296-01527-2:Ernst Hohenthal: "A family secret in the public domain".
Dissertation in the History of Art presented to the Faculties of the University of Pennsylvania, Philadelphia 2005.: Bruno Eble, "Gerhard Richter : la surface du regard", L'Harmattan, 2006, 237 p. ISBN 978-2-296-01527-2:Ernst Hohenthal: "A family secret in the public domain".