@article{article502e794b,
title   = {Identification of the state of a wet spouted bed through time-frequency analysis of pressure fluctuation time series},
author = {Oliveira, Wanderley Pereira de and Souza, Cláudia Regina Fernandes de and Lim, C. Jim and Grace, John R.},
year = {2009},
doi = {10.1002/cjce.20159},
journal   = {Canadian Journal of Chemical Engineering}
}