@article{HartmannRichterSchuetteetal.2017, author = {Carsten Hartmann and Lorenz Richter and Christof Sch{\"u}tte and Wei Zhang}, title = {Variational characterization of free energy: theory and algorithms}, journal = {Entropy}, volume = {19}, number = {11}, doi = {10.3390/e19110626}, year = {2017}, }