On Some Union and Intersection Problems for Polygons with Fixed Orientations. Widmayer, P., Wu, Y., Schlag, M., & Wong, C. Computing, 36:183-197, 1986.
bibtex   
@ARTICLE{WidmayerWS1986J,
  author = {P. Widmayer and Y.F. Wu and M.D.F. Schlag and C.K. Wong},
  title = {{O}n {S}ome {U}nion and {I}ntersection {P}roblems for {P}olygons
	with {F}ixed {O}rientations.},
  journal = {Computing},
  year = {1986},
  volume = {36},
  pages = {183-197}
}

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