Large amount of observational spectroscopic data are recently available from different observational projects, like Sloan Digital Sky Survey. Its become more urgent to identify white dwarfs stars based on data itself i.e. without modelling white dwar
f atmospheres. In particular, existing methods of white dwarfs identification presented in Kleinman et al. (2004) and in Eisenstein et al. (2006) did not allow to find all the white dwarfs in examined data. We intend to test various criteria of searching for white dwarf candidates, based on photometric and spectral features.
