Two-color quark matter: U(1)_A restoration, superfluidity, and quarkyonic phase
Tomáš Brauner, Kenji Fukushima, and Yoshimasa Hidaka
[Phys.Rev.D80,074035 (2009).]

Phase diagrams in the three-fracor Nambu--Jona-Lasinio model
with the Polyakov loop
Kenji Fukushima
[Phys. Rev. D 77, 114028 (2008).]

Mesonic correlation functions at finite temperature and density in the Nambu–Jona-Lasinio model with a Polyakov loop
H. Hansen, W. M. Alberico, A. Beraudo, A. Molinari, M. Nardi, and C. Ratti
[Phys. Rev. D 75, 065004 (2007).]