Finding paths of length $k$ in $O^*(2^k)$ time. Williams, R. Inform Process Lett, 109(6):315–318, 2009.
bibtex   
@Article{williams09finding,
  author  = {Ryan Williams},
  title   = {Finding paths of length $k$ in {$O^*(2^k)$} time},
  journal = IPL,
  year    = {2009},
  volume  = {109},
  number  = {6},
  pages   = {315--318},
}

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