@article{article6992240c,
title   = {MODIS Aerosol Optical Depth Retrievals with high spatial resolution over an Urban Area using the Critical Reflectance},
author = {Castanho, Andrea D de Almeida and Martins, J Vanderlei and Artaxo Netto, Paulo Eduardo},
year = {2008},
doi = {10.1029/2007jd008751},
journal   = {Journal of Geophysical Research-Atmospheric}
}