E. Mohammadi, J. Towfighi, J. Safdari, and M. H. Mallah, “Study of holdup and slip velocity in an L-shaped pulsed sieve-plate extraction column”, Int. J. Ind. Chem., vol. 10, no. 1, Nov. 2023, doi: https://doi.org/10.1007/s40090-018-0167-y.