Bourrel, S., Babary, J.-P., Julien, S., Nihtila, M. T., & Dochain, D. (1998). Modelling and identification of a fixed bed denitrification bioreactor. Systems Analysis Modelling Simulation : journal of mathematical modelling and simulation in systems analysis, 30, 289-309. https://hdl.handle.net/2078.5/63478 (Original work published 1998)