Ramirez, I. D.; Ramírez Villareal, A.; Ospina Nieto, J. D. Modeling and Nonlinear Control of Volatile Fatty Acids in an Upflow Anaerobic Fixed Bed Biofilm Reactor (UAFBR). rev.ing.univ.Medellin 2019, 19 (36), 53-69. https://doi.org/10.22395/rium.v19n36a3.