Modern art: who cares? : an interdisciplinary research project and an international symposium on the conservation of modern and contemporary art / eds. IJsbrand Hummelen … Gummi : die elastische Faszination / [hrsg.] von Ulrich Giersch und Ulrich Kubisch Restoration project "Dutch guns in Russia" : the restoration of 17th and 18th century Dutch firarms from the Kremlin Armoury / Restoration projects: H.L. Visser, …