@article{article54d9188c,
title   = {Automatic estimation of crowd density using texture},
author = {Marana, A N and Velastin, S A and Costa, Luciano da Fontoura and Lotufo, R A},
year = {1998},
doi = {10.1016/s0925-7535(97)00081-7},
journal   = {Safety Science}
}