E.A.Milne and the Universes of Newton and Relativistic Cosmology
  Here the 1930's work of Milne on the relationship between the universes of relativistic cosmology and those which follow from Newtonian theory is reviewed. The extension to the case of non-zero pressure is considered also. In each case, any assumptions made are noted and the thermodynamic implications of these are explored in the final section. 
J.Dunning-Davies