S. Plyushchay, "Relativistic particle with torsion, Majorana equation and fractional spin," Phys. Lett. B 262, 71 (1991). [126] M. S. Plyushchay, "Monopole Chern-Simons term: Charge-monopole system as a particle with spin", Nucl. Phys. B 589 (2000) 413, [arXiv:0004032[hep-th]]. [127] J. Polchinski, "String theory.