What is an oil sketch and why did Rubens use them?
Works of art in their own right
As vaporous and intangible as an idea
Natalya Gritsay, Alexey Larionov, Stephanie-Suzanne Durante, E. Vegelin, J. Woodall, Peter Paul Rubens: Oil Sketches and Related Works from the State Hermitage Museum and Courtauld Institute Gallery, pub. Prestel Publishing Ltd, 01/01/2004 www.amazon.co.uk