  In this work we extend the JIMWLK formalism to the two-source problem. The
S-matrix for the forward scattering can be written in a double functional
integral representation which involves the usual functional integral for the
gluon field and the spin path integral for the external color sources.
Modifications needed in the light-cone gauge are discussed. Using our source
term we compute the produced gluon field and discuss the duality of the high
energy evolution kernel in the pA collision.
