On the lower operation limit and the gain of flexibility of an innovative segmented tray column
H. Fasel, M. Grünewald, J. Riese, Journal of Advanced Manufacturing and Processing 5 (2022).

A systematic approach to define flexibility in chemical engineering
B. Bruns, F. Herrmann, M. Polyakova, M. Grünewald, J. Riese, Journal of Advanced Manufacturing and Processing 2 (2020).