TY - RPRT TI - Exact free energy functional for a driven diffusive open stationary nonequilibrium system. AU - B Derrida AU - J L Lebowitz AU - E R Speer PY - 2002 DO - 10.1103/physrevlett.89.030601 UR - https://pubmed.ncbi.nlm.nih.gov/12144382/ ID - 12144382 ER -