Cite
HARVARD Citation
Guichelaar, J. (2018) Willem de Sitter : Einstein's friend and opponent. [Online]. Cham, Switzerland : Springer. Available from: http://access.bl.uk/ark:/81055/vdc_100067416123.0x000001
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Guichelaar, J. (2018) Willem de Sitter : Einstein's friend and opponent. [Online]. Cham, Switzerland : Springer. Available from: http://access.bl.uk/ark:/81055/vdc_100067416123.0x000001