Critical behaviors near the (tri-)critical end point of QCD within the NJL model Ya Lu, Yi-Lun Du, Zhu-Fang Cui and Hong-Shi Zong Eur. Phys. J. C, 75 10 (2015) 495 Published online: 19 October 2015 DOI: 10.1140/epjc/s10052-015-3720-2