Two-potential theory of electric and magnetic charges via duality   transformation
  Dirac, Schwinger and Zwanziger theories of electric and magnetic charges are obtained via duality transformation. Analogous construction for three Euclidean dimensions, with magnetic charges interacting with electric currents, is also done. The role of Dirac strings as dislocations in the configurations of gauge potential is emphasized. 
Chandrasekhar Chatterjee, Indrajit Mitra and H.S.Sharatchandra
hep-th