@online{jimenez+2018-constratio,
  author="Jimenez, Michael R. and M{\"u}ller, Christian and Pottmann, Helmut",
  title="Discretizations of surfaces with constant ratio of principal curvatures",
  year="2018",
  note="preprint",
  url="http://www.geometrie.tuwien.ac.at/ig/publications/constratio/constratio.pdf"
}