Summary
Particles as extended bodies rotating in the 4-space of Minkowski. The explanation of the existence of half-integer spin (here ħ/2) rests on the division of an integer polar spin (here ħ@#@) into two spins, one in the ordinary space about the planex, 0,y, the other about the space-time planez, 0, τ (both equal here to ħ/2@#@).
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Malcor, R. On the spatio-temporal extension of elementary particles. Lett. Nuovo Cimento 42, 435–437 (1985). https://doi.org/10.1007/BF02749450
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DOI: https://doi.org/10.1007/BF02749450