An analytical approach for the closure equations of gas-solid flows with inter-particle collisionsKartušinski, Aleksander; Michaelides, EfstathiosInternational journal of multiphase flow2004 / 2, p. 159-180 https://www.sciencedirect.com/science/article/pii/S0301932203002192

Comparison of the RANS and PDF methods for air-particle flowsKartušinski, Aleksander; Michaelides, Efstathios; Zaichik, LeonidInternational journal of multiphase flow2009 / 10, p. 914-923 : ill https://www.sciencedirect.com/science/article/abs/pii/S0301932209000986