@article{articlee815706d,
title   = {Model-based soft-sensor design for on-line estimation of the biological activity in activated sludge wastewater treatment plants},
author = {Zanabria Sotomayor, Oscar Alberto and Park, Song Won and Garcia, Claudio},
year = {2001},
journal   = {Boletim Técnico da Escola Politécnica da USP. Departamento de Engenharia de Telecomunicações e Controle}
}