Article Siska De Baerdemaeker; Mike D. Schneider (2022)
Better Appreciating the Scale of It: Lemaître and de Sitter at the BAAS Centenary. HOPOS (pp. 170-188). (/isis/citation/CBB352852046/) unapi

Book Jan Guichelaar (2018)
Willem de Sitter: Einstein's Friend and Opponent. (/isis/citation/CBB389004179/) unapi

Article Hao, Liuxiang (2011)
The Equivalence Principle and Gauge Theories of Gravity. Ziran Kexueshi Yanjiu (Studies in the History of Natural Sciences) (pp. 241-255). (/isis/citation/CBB001210057/) unapi

Article Baneke, David (2010)
Teach and Travel: Leiden Observatory and the Renaissance of Dutch Astronomy in the Interwar Years. Journal for the History of Astronomy (p. 167). (/isis/citation/CBB001021153/) unapi

Article Smith, Robert W. (2009)
Beyond the Galaxy: The Development of Extragalactic Astronomy 1885--1965, Part 2. Journal for the History of Astronomy (p. 71). (/isis/citation/CBB000930146/) unapi

Book Kerszberg, Pierre (1989)
The invented universe: The Einstein-De Sitter controversy (1916-17) and the rise of relativistic cosmology. (/isis/citation/CBB000045949/) unapi

Article Kerszberg, Pierre (1987)
The relativity of rotation in the early foundations of general relativity. Studies in History and Philosophy of Science (pp. 53-79). (/isis/citation/CBB000048839/) unapi

Article Jahn, Carla; Kahn, Franz (1975)
Letters from Einstein to de Sitter on the nature of the universe. Nature (pp. 451-454). (/isis/citation/CBB000019910/) unapi