@Misc{ 
  DíaVerVla15,
  author = { Díaz, Juan Pablo and Verjovsky, Alberto and Vlacci, Fabio },
  title = { Quaternionic Kleinian modular groups and arithmetic hyperbolic orbifolds over the quaternions },
  journal = { arXiv:1503.07214 [math.GT] },
  year = { 2015 },
  pages = {  },
  URL = { https://gecogedi.dimai.unifi.it/paper/151/ },
  note = { cvgmt preprint}
}