• Gas-solid particle mixture in vertical duct by RANS approachKartušinski, Aleksander; Michaelides, S.E.; Pihlak, UkuChemical and process engineering2005 / 3, p. 413-426 https://www.researchgate.net/publication/290058444_Gas-solid_particle_mixture_in_vertical_duct_by_RANS_approach