Schmidt, Fabian Physical Cosmology, MPI for Astrophysics, Max Planck Society;
Dai, L., Pajer, E., & Schmidt, F. (2015). On separate universes. Journal of Cosmology and Astroparticle Physics, 2015(10): 059, pp. 1-36. doi:10.1088/1475-7516/2015/10/059.