@Misc{ 
  Ang17,
  author = { Angella, Daniele },
  title = { SageMath experiments in Differential and Complex Geometry },
  journal = { arXiv:1704.04175 [math.DG] },
  year = { 2017 },
  pages = {  },
  URL = { https://gecogedi.dimai.unifi.it/paper/206/ },
  note = { cvgmt preprint}
}