1. Balchen, J. G., & Mummé, K. I., 1988. Process control. Structures and applications. New York: Van Nostrand Reinhold.
2. Faanes, A., & Skogestad, S., 1999. Control structure selection for serial processes with application to pH-neutralization. Procedings of the European Control Conferance, ECC 99, Aug. 31-Sept. 3, 1999. Germany: Karlsruhe.
3. Buffer Tank Design for Acceptable Control Performance;Faanes;Ind. Eng. Chem. Res.,2003
4. McMillan, G. K., 1984. pH control. Research Triangle Park, NC, USA: Instrument Society of America.
5. Proudfoot, C. G., 1983. Industrial implementation of on-line computer control of pH, Ph.D. Thesis. University of Oxford, UK.