@misc{Nielsen_J._Model_1977, author={Nielsen, J.}, volume={29}, number={4}, copyright={Creative Commons Attribution BY 4.0 license}, address={Warszawa}, journal={Archives of Mechanics}, howpublished={online}, year={1977}, publisher={Polish Scientific Publishers IFTR}, language={eng}, language={pol}, language={rus}, title={Model laws for granular media and powders with a special view to silo models}, type={Text}, URL={http://rcin.org.pl/Content/102683/PDF/WA727_91308_P.262a-Nielsen-Model.pdf}, keywords={Mechanika stosowana - czasopisma [KABA]}, }