@Misc{ 
  Nic16,
  author = { Nicolussi Golo, Sebastiano },
  title = { Some remarks on contact variations in the first Heisenberg group },
  journal = {  },
  year = { 2016 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2928/ },
  note = { cvgmt preprint}
}