@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} }