for example by Campbell in: National Gallery Catalogues (new series) : The Fifteenth Century Netherlandish Paintings, p. 72, Lorne Campbell, 1998, ISBN 185709171 and his 1974 Burlington article TSTOR specifically dealing with the authorship of the work
JSTOR, Art Bulletin reprinted in: Meyer Schapiro, Selected Papers, volume 3, Late Antique, Early Christian and Mediaeval Art, 1980, Chatto & Windus, London, ISBN 0701125144
