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Ulf Linde
Ulf Harald Linde (born 1929 in Stockholm) is an art critic, writer, museum director and a member of the Swedish Academy.

See also Franck Scurti: Ulf Linde – Marcel DuchampCertifié pour copie conforme (DVD)

English edition
Sternberg Press
Ulf Linde summarizes his decades of investigation into the geometry of Duchamp's works.