1. Gas–liquid flow in bubble columns and loop reactors;Becker;Chemical Engineering Science,1994
2. Becker, S. (1997). Experimentelle Untersuchungen von Blasensäulen als Basis für detaillierte Modellrechnungen. Fortschritt-Berichte, Reihe 3, Nr. 467. Düsseldorf: VDI-Verlag.
3. Laser-Doppler measurements of bubble dynamics;Brankovic;Physical, Fluids,1984
4. Effect of liquid depth on circulation in bubble columns;Chen;Chemical Engineering Research and Development,1989
5. Durst, F., & Zare, M. (1975). Laser-Doppler measurements in two-phase flows. Proceedings of the LDA-symposium, Copenhagen: Denmark (pp. 403–429).