VELS HEIJN, A. A. E. In memoriam Willy Halsema-Kubes. The Rijksmuseum Bulletin, [S. l.], v. 40, n. 2, p. 135–137, 1992. DOI: 10.52476/trb.20562. Disponível em: https://bulletin.rijksmuseum.nl/article/view/20562.. Acesso em: 26 dec. 2024.