@revista_internacional{210,
  author = {Luis Martínez and Luis Gonzaga Pérez and Manuel José Barranco},
  title = {A Multi-granular Linguistic Content-based Recommendation Model},
  year = {2007},
  journal = {International Journal of Intelligent Systems},
  volume = {22},
  number = {5},
  pages = {419-434},
  publisher = {Wiley},
  url = {http://onlinelibrary.wiley.com/doi/10.1002/int.20207/pdf},
}