Study of Supernovae Important for Cosmology
  The dense shell method for the determination of distances to type IIn
supernovae has been briefly reviewed. Applying our method to SN 2006gy, SN
2009ip, and SN 2010jl supernovae, we have obtained distances in excellent
agreement with the previously known distances to the parent galaxies. The dense
shell method is based on the radiation hydrodynamic model of a supernova. The
method of the blackbody model, as well as the correctness of its application
for simple estimates of distances from observation data, has been justified.
