Singular low-energy states of tilted Dirac semimetals induced by the fermion-fermion interactions Jie-Qiong Li, Dong-Xing Zheng and Jing Wang Eur. Phys. J. B, 92 12 (2019) 274 Published online: 18 December 2019 DOI: 10.1140/epjb/e2019-100373-9