Minimum-link paths revisited. Mitchell, J. S. B., Polishchuk, V., & Sysikaski, M. Comput. Geom., 47(6):651--667, 2014.
bibtex   
@article{DBLP:journals/comgeo/MitchellPS14,
  author    = {Joseph S. B. Mitchell and
               Valentin Polishchuk and
               Mikko Sysikaski},
  title     = {Minimum-link paths revisited},
  journal   = {Comput. Geom.},
  volume    = {47},
  number    = {6},
  pages     = {651--667},
  year      = {2014}
}

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