1. F. Zwicky, Die rotverschiebung von extragalaktischen nebeln. Helv. Phys. Acta 6, 110–127 (1933)
2. K.G. Begeman, A.H. Broeils, R.H. Sanders, Extended rotation curves of spiral galaxies: dark haloes and modified dynamics. Mon. Not. R. Astron. Soc. 249(3), 523–537 (1991)
3. D. Walsh, R.F. Carswell, R.J. Weymann, 0957+ 561 a, b: twin quasistellar objects or gravitational lens? Nature 279(5712), 381 (1979)
4. N. Aghanim, Y. Akrami, M. Ashdown, J. Aumont, C. Baccigalupi, M. Ballardini, A.J. Banday, R.B. Barreiro, N. Bartolo, S. Basak, et al. Planck 2018 results. vi. cosmological parameters. arXiv:1807.06209 (2018)
5. M. Battaglieri, A. Belloni, A. Chou, P. Cushman, B. Echenard, J. Essig, R. Estrada, J.L. Feng, B. Flaugher, P.J. Fox, et al. Us cosmic visions: new ideas in dark matter 2017: community report. arXiv:1707.04591 (2017)