The abelian and non-abelian Josephson effect and pseudo-goldstone bosons
  We formulate the Josephson effect in a field theoretic language which affords a straightforward generalization to the non-abelian case. We give some examples and apply the formalism to the case of SO(5) superconductivity. 
Paul Esposito, L.-P. Guay, R. B. MacKenzie, M. B. Paranjape, L.C.R   Wijewardhana