Ao. Barut et Hg. Cruz, CLASSICAL RELATIVISTIC SPINNING PARTICLE WITH ANOMALOUS MAGNETIC-MOMENT - THE PRECESSION OF SPIN, Journal of physics. A, mathematical and general, 26(22), 1993, pp. 6499-6506
The theory of classical relativistic spinning particles with c-number
internal spinor variables, modelling accurately the Dirac electron, is
generalized to particles with anomalous magnetic moments. The equatio
ns of motion are derived and the problem of spin precession is discuss
ed and compared with other theories of spin.