Lepton number as the fourth color by Jogesh Pati and Abdus Salam (source code)

= Lepton number as the fourth color by Jogesh Pati and Abdus Salam
{c}
{tag=Work by Jogesh Pati}
{tag=Work by Abdus Salam}
{title2=1974}

https://doi.org/10.1103/PhysRevD.10.275

Physical Review D10, pp. 275–289. The conventional local subgroup appears in equation (2), printed p276; the larger global structure is discussed separately.