Bandaru, K. S., Keßler, L. C., Wolff, M. W., Reichl, U., Seidel-Morgenstern, A., & Pushpavanam, S. (2007). Hydrodynamic characteristics and expansion behavior of beds containing single and binary-mixtures of particles. Industrial and Engineering Chemistry Research, 46(13), 4686-4694. doi:10.1021/ie061580x.