@Misc{ 
  GorPanTep17,
  author = { Gordon, Joseph and Panina, Gaiane and Teplitskaya, Yana },
  title = { Polygons with prescribed edge slopes: configuration space and extremal
  points of perimeter },
  journal = {  },
  year = { 2017 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5906/ },
  note = { cvgmt preprint}
}