We present the description of hadronic three-body systems in valence approximation within a rigorous Light-Front approach [1,2]. The latter has been applied in particular to the analysis
of electron deep inelastic scattering (DIS) on nuclear targets, in the valence region and in the Bjorken limit [3,4].
The approach preserves Poincaré covariance, macroscopic locality, as well as number of particles and momentum sum rules. In this framework, the main theoretical ingredient is the LF nuclear spectral function properly related to the relative
momentum distribution. This quantity has been used to realistically calculate the structure functions of the three-nucleon iso-doublet, very relevant for phenomenological studies in the present experimental scenario. At variance with previous light-front estimates for heavy nuclei, our analysis predicts a sizable European Muon Collaboration (EMC) effect,
in fair agreement with available data. Notably, in the valence region, our results are rather independent with respect to the use of different parametrizations of the nucleon DIS structure functions and that of nuclear two- and three-body potentials .
 "Light-Front spin-dependent Spectral Function and Nucleon Momentum
Distributions for a Three-Body System"
by A. Del Dotto, E. Pace, G. Salme', S. Scopetta
Phys. Rev. C 95 (2017) 1, 014001 and arXiv:1609.03804 [nucl-th]
 "Light-Front Transverse Momentum Distributions for J=1/2
Hadronic Systems in Valence Approximation",
by R. Alessandro, A. Del Dotto, E. Pace, G. Perna,
G. Salme', S. Scopetta, Phys. Rev. C 104 (2021) 6, 065204 and arXiv:2107.10187
 "EMC effect, few-nucleon systems and Poincaré covariance",
by E. Pace, M. Rinaldi, G. Salme', S. Scopetta, Phys. Scr. 95 (2020) 064008
 E. Pace, M. Rinaldi, G. Salme', S. Scopetta, arXiv:2206.05485