K. Kovar, T. K. Friedli, D. Roubicek, D. S. Langenegger, M. Keller, and H.-P. Meyer, “Process Optimisation Based on Large Databases of Routinely Monitored Industrial Process Data”, Chimia, vol. 59, no. 10, p. 753, Oct. 2005, doi: 10.2533/000942905777675688.