Switch-off of swissbib: As of December 7th 2020 data on swissbib will only be updated partially. swissbib will remain online until March 31st 2021, further information in the blog.
[editor] Adriaan E. Waiboer, with Arthur K. Wheelock, Jr and Blaise Ducos ; with contributions by Piet Bakker, Quentin Buvelot, E. Melanie Gifford [und 4 weiteren] ; National Gallery of Ireland, Dublin, National Gallery of Art, Washington, Musée du Louvre, Paris