@Article{ 
  TodPig17,
  author = { Pigazzini, Alexander and Toda, Magdalena },
  title = { A Note on the Class of Surfaces with Constant Skew Curvatures. },
  journal = { J. Geom. Symmetry Phys. 46: 51-58 },
  year = { 2017 },
  volume = { 46 },
  pages = { 51-58 },
  URL = { https://gecogedi.dimai.unifi.it/paper/435/ },
  note = { cvgmt preprint}
}