Ks. Govinder et al., THE ALGEBRAIC STRUCTURE OF GENERALIZED ERMAKOV SYSTEMS IN 3 DIMENSIONS, Journal of physics. A, mathematical and general, 26(16), 1993, pp. 4035-4046
The characteristic algebra of generalized Ermakov systems is sl(2, R).
The structure of these systems in three dimensions is obtained. A sub
set in the form of an equation of motion with the additional requireme
nt of so(3) symmetry is studied. It includes the classical equation of
the magnetic monopole. The existence of three vectors of Poincare typ
e is established. Consideration is given to weak generalized Ermakov s
ystems in which the symmetry breaking occurs in the radial equation.