The Mass Distribution of White Dwarfs: An Unwavering Obsession
  We discuss some of our current knowledge of the mass distribution of DA and non-DA stars using various methods for measuring white dwarf masses including spectroscopic, trigonometric parallax, and gravitational redshift measurements, with a particular emphasis on the problems encountered at the low end of the cooling sequence where energy transport by convection becomes important. 
P. Bergeron, A. Gianninas, and S. Boudreault