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Hubble, E. A Relation between Distance and Radial Velocity among Extra-Galactic Nebulae. Proceedings of the National Academy of Sciences. Т. 15. 1929. DOI:10.1073/pnas.15.3.168. с. 168 – 173.
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Zwicky, F. Entdecken, Erfinden, Forschen im morphologischen Weltbild. Muenchen: Droemer. Muenchen, Droemer, 1966. (page 237). This reference was identified from a footnote provided in an online essay: Knill, Oliver. Moving the Solar System. November 1997. Посетен на 17 юли 2007..
Zwicky, F. On the Red Shift of Spectral Lines through Interstellar Space. Proceedings of the National Academy of Sciences. Т. 15. 1929. DOI:10.1073/pnas.15.10.773. с. 773 – 779. (full article)