P.C. van der Kruit, K. van Berkel, The legacy of J. C. Kapteyn. Studies on Kapteyn and the development of modern astronomy. BMGN - Low Countries Historical Review, [S. l.], v. 116, n. 4, p. 543–544, 2001. DOI: 10.18352/bmgn-lchr.5589. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-106417.. Acesso em: 18 jul. 2024.