@inproceedings{Maas:2013dR, author = "Maas, Axel and Zwanziger, Daniel", title = "{Bounds on free energy in QCD}", doi = "10.22323/1.171.0032", booktitle = "Proceedings of Xth Quark Confinement and the Hadron Spectrum {\textemdash} PoS(Confinement X)", year = 2013, volume = "171", pages = "032" }