@ARTICLE{CSSE19,
author = {Giuseppe Della Penna and Sergio Orefice},
title = {Using spatial relations for qualitative specification of gestures},
doi = {10.32604/csse.2019.34.325},
journal = {Computer Systems Science and Engineering},
editor = {CRL Publishing},
pages = {325--338},
year = {2019},
month = {11},
volume = {34},
number = {6}
}