The Bruegel success story : papers presented at Symposium XXI for the Study of Underdrawing and Technology in Painting, Brussels, 12-14 September 2018 - Vanwijnsberghe, Dominique, editor; Stroo, Cyriel, editor; Fransen, Bart, editor; Allard, D. editor (Dominique); Currie, Christina, editor (Leuven ; Paris ; Bristol, CT : Peeters, 2021)