To cite graphlayouts in publications use:

Schoch D (2019). graphlayouts: Additional Layout Algorithms for Network Visualizations. https://github.com/schochastics/graphlayouts.

Corresponding BibTeX entry:

  @Manual{,
    title = {graphlayouts: Additional Layout Algorithms for Network
      Visualizations},
    author = {David Schoch},
    year = {2019},
    url = {https://github.com/schochastics/graphlayouts},
  }