Where are all the Sirius-like binary systems?

@article{Holberg2013WhereAA,
  title={Where are all the Sirius-like binary systems?},
  author={Jay B. Holberg and Terry D. Oswalt and Edward M. Sion and Martin A. Barstow and Matthew R. Burleigh},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2013},
  volume={435},
  pages={2077-2091}
}
Approximately 70 percent of the nearby white dwarfs appear to be single stars, with the remainder being members of binary or multiple star systems. The most numerous and most easily identifiable systems are those in which the main sequence companion is an M star, since even if the systems are unresolved the white dwarf either dominates or is at least competitive with the luminosity of the companion at optical wavelengths. Harder to identify are systems where the non-degenerate component has a… 

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