The Wigner solution of quark gap equation and chiral phase transition of QCD at finite temperature and nonzero chemical potentialZhu-fang Cui, Chao Shi, Yong-hui Xia, Yu Jiang and Hong-shi ZongEur. Phys. J. C, 73 10 (2013) 2612DOI: https://doi.org/10.1140/epjc/s10052-013-2612-6