Aguilar-Lopez, R., Neria-Gonzalez, M.L. and Soto-Corte, G. 2006. Tracking substrate trajectories in continuous aerobic wastewater reactors via nonlinear PI controllers. Journal of Applied Research and Technology. 4, 01 (Apr. 2006). DOI:https://doi.org/10.22201/icat.16656423.2006.4.01.545.