Meisterwerke der niederländischen Malerei des 15. und 16. Jahrhundert  

"Significant research on Early Netherlandish painting occurred in the 1920s, in Max Jakob Friedländer's pioneering Meisterwerke der niederländischen Malerei des 15. und 16. Jahrhundert, which was followed by the analysis of Erwin Panofsky in the 1950s and 60s. This research tended to focus on establishing biographies and interpreting the complex iconography, while more recent research, notably by Lorne Campbell of the National Gallery, London, relies on X-ray and infra-red photography to develop a understanding of the techniques and materials used by the painters."--Sholem Stein