@article{recommendationsystemsfortourismbasedon,
  title = {Recommendation Systems for Tourism Based on Social Networks: A Survey},
  author = {Alan Menk and Laura Sebastia and Rebeca Ferreira},
  year = {2019},
  eprint = {1903.12099},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1903.12099v1},
}