@article{Berg_2008 author = {B. V. Berg and V. A. Mikula and E. I. Levin and T. F. Bogatova}, title = {Organization of Directed Vertical Motion of Disperse Material in a Fluidized Bed}, journal = {Heat Transfer Research}, issn = {1064-2285}, year = {2008}, volume = {39}, number = {2}, pages = {91--99} }