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Nieuwenhuizen, Theodorus M. (5 October 2016). "How Zwicky already ruled out modified gravity theories without dark matter". Fortschritte der Physik. 65 (6–8): 1600050. arXiv:1610.01543. doi:10.1002/prop.201600050. S2CID118676940.
Nieuwenhuizen, Theodorus M. (5 October 2016). "How Zwicky already ruled out modified gravity theories without dark matter". Fortschritte der Physik. 65 (6–8): 1600050. arXiv:1610.01543. doi:10.1002/prop.201600050. S2CID118676940.
Nieuwenhuizen, Theodorus M. (5 October 2016). "How Zwicky already ruled out modified gravity theories without dark matter". Fortschritte der Physik. 65 (6–8): 1600050. arXiv:1610.01543. doi:10.1002/prop.201600050. S2CID118676940.