In this paper was proved (i) the equivalence of Dirac equation for mass $\mathsf{m}$ with two entangled Proca fields of mass $\mathsf{2m}$ and (ii) is proposed an equation and (iii) an 12-dimensional Lie algebra for the entangled spin fields.
A search on Dirac equation
The Dirac equation as a quantum walk: higher dimensions, observational convergence
Dirac equation with ultraviolet cutoff and quantum walk
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