Ramirez, I. D., Ramírez Villareal, A., & Ospina Nieto, J. D. (2019). Modeling and nonlinear control of volatile fatty acids in an upflow anaerobic fixed bed biofilm reactor (UAFBR). Revista Ingenierías Universidad De Medellín, 19(36), 53–69. https://doi.org/10.22395/rium.v19n36a3