In 2014, Hasdeo et al., considered the "Breit-Wigner-Fano line shapes in Raman spectra of graphene". An asymmetric BWF Raman line appears in graphene due to the "excitation of electron-hole pairs in the vicinity of the Dirac cone". Asymmetry is therefore consequence of an "interference effect between the phonon spectra and the electron-hole pair excitation spectra" . In 2013, Yoon et al. worked on the "Fano resonances and their strong doping dependence", using Raman scattering of single-layer graphene (SLG). "As the Fermi level is varied by a back-gate bias, the Raman G band of SLG exhibits an asymmetric line shape … The observed Fano resonance can be interpreted as interferences between the phonon and excitonic many-body spectra in SLG" . Fano resonances have been also observed "in infrared spectra of bilayer graphene (BLG) in the presence of an energy band gap generated by a perpendicular electric field, which can be interpreted as the inference between the phonon and a continuum spectrum of electronic transitions near the bandgap" (Yoon and coworkers, referring to . Since 2010, many works have been published about Fano resonances in graphene. This large literature requires a further specific review.