Is There Only One Solution of the Dyson-Schwinger Equation for Quark   Propagator in the Case of Non-zero Current Quark Mass
  In this letter it is shown on general ground that there exist two qualitatively distinct solutions of the Dyson-Schwinger equation for the quark propagator in the case of non-zero current quark mass. One solution corresponds to the ``Nambu-Goldstone'' phase and the other one corresponds to the ``Wigner'' phase in the chiral limit. 
Hong-Shi Zong, Wei-Min Sun, Jia-Lun Ping, Xiao-fu Lu, and Fan Wang