@article { valfrecar2016, author = "Valadas, Sara and Freire, Rita and Cardoso, Ana and Mirao, Jose and Vandenabeele, Peter and Caetano, Joaquim and Candeias, Antonio", title = "New insight on the underdrawing of 16th Flemish-Portuguese easel paintings by combined surface analysis and microanalytical techniques", year = "2016" }