@incollection{Negrón12,
author = {Adriana Peña Pérez Negrón and Raúl A. Aguilar and Luis A. Casillas},
title = {The Users' Avatars Nonverbal Interaction in Collaborative Virtual Environments for Learning},
booktitle = {Virtual Reality and Environments},
publisher = {IntechOpen},
address = {Rijeka},
year = {2012},
editor = {Cecilia Sik Lanyi},
chapter = {4},
doi = {10.5772/36202},
url = {https://doi.org/10.5772/36202}
}