1. T. Appelquist and J. Carazzone, Infrared singularities and massive fields, Phys. Rev. D 11 (1975) 2856 [ INSPIRE ].
2. U. Aydemir, D. Minic, C. Sun and T. Takeuchi, Pati-Salam unification from non-commutative geometry and the TeV-scale W R boson, arXiv:1509.01606 [ INSPIRE ].
3. V.D. Barger, E. Ma and K. Whisnant, General analysis of a possible second weak neutral current in gauge models, Phys. Rev. D 26 (1982) 2378 [ INSPIRE ].
4. A.H. Chamseddine and A. Connes, Universal formula for noncommutative geometry actions: unification of gravity and the Standard Model, Phys. Rev. Lett. 77 (1996) 4868 [ INSPIRE ].
5. A.H. Chamseddine and A. Connes, The spectral action principle, Commun. Math. Phys. 186 (1997) 731 [ hep-th/9606001 ] [ INSPIRE ].