Edwin Hubble. A relation between distance and radial velocity among extra-galactic nebulae // Proc. N.A.S., vol. 15, p.168-173, 1929

Edwin Hubble. A relation between distance and radial velocity among extra-galactic nebulae // Proc. N.A.S., vol. 15, p.168-173, 1929

Edwin Hubble. A relation between distance and radial velocity among extra-galactic nebulae // Proc. N.A.S., vol. 15, p.168-173, 1929