Hydrodynamic Maxwell demon in granular systems Brey, J. Javier ; Moreno, F. ; García-Rojo, R. ; Ruiz-Montero, M. J. Abstract Publication: Physical Review E Pub Date: December 2001 DOI: 10.1103/PhysRevE.65.011305 Bibcode: 2001PhRvE..65a1305B