Charges, Monopoles and Gauge Invariance
  A systematic approach to the description of gauge invariant charges is presented and applied to the construction of both the static colour charge configuration in QCD and the monopole solution in pure SU(2). The gauge invariant non-abelian monopole offers a new style of order parameter for monopole condensation. 
R Horan, A Khvedelidze, M Lavelle and D McMullan