Quantized Intrinsic Redshift in Cosmological General Relativity
  There are now several analyses reporting quantized differences in the redshifts between pairs of galaxies. In the simplest cases, these differential redshifts are found to be harmonics of fundamental periods of approximately 72 km/s and 37.5 km/s. In this paper a wave equation is derived based on cosmological general relativity, which is a space-velocity theory of the expanding Universe. The wave equation is approximated to first order and comparisons are made between the quantized solutions and the reported observations. 
Firmin J. Oliveira (Joint Astronomy Centre, Hilo, Hawai`i, U.S.A.)