The Building up and Evolution of Galactic Disks
  The formation and evolution of disk galaxies in the cosmological context is studied. We consider the observable properties of disk galaxies and treat the disk formation and galactic evolutionary processes in a self-consistent fashion. We find the matter accretion regime to be the dominant ingredient in establishing the Hubble sequence. The accretion regime is a phenomenon directly related to the statistical properties of the primordial density fluctuations from which disk galaxies emerged. In this paper we assumed a Gaussian density field and a standard CDM model. 
Claudio Firmani, Vladimir Avila-Reese, and Xavier Hern\'andez (Centro   de Instrumentos,UNAM, Instituto de Astronomia,UNAM)