@article{article2d975fd8,
title   = {Improved ring approximation for the free energy in thermal scalar field theory},
author = {Brandt, Fernando Tadeu Caldeira and Siqueira, Joã Bosco de and Frenkel, Josif},
year = {2014},
doi = {10.1209/0295-5075/105/51001},
journal   = {JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS}
}