@article{Conde2015,
  title = {A comprehensive framework for modeling heterogeneous objects},
  author = {Conde-Rodr{\'\i}guez, Francisco and Torres, Juan-Carlos and Garc{\'\i}a-Fern{\'a}ndez, {\'A}ngel-Luis and Feito-Higueruela, Francisco-Ram{\'o}n},
  journal = {The Visual Computer},
  pages = {1--15},
  year = {2015},
  publisher = {Springer}
}