VAN THIEL, P. J. J. In memoriam Luitsen Kuiper 1936-1989. The Rijksmuseum Bulletin, [S. l.], v. 37, n. 4, p. 307–309, 1989. DOI: 10.52476/trb.20661. Disponível em: https://testplatform.openjournals.nl/the-rijksmuseum-bulletin/article/view/20661. Acesso em: 11 apr. 2026.