Two-dimensional Stationary Wake Fields in Vortexfree Cold Plasma. I
  Present paper is devoted to formulation of the system of the master equations of the problem and analytical considerations of the limiting cases, which have an exact solutions (transversal and longitudinal flat bunches, linear approxim- ation). Presented consideration gives some hints to the construction of proper algorithm for numerical calculations. 
A.Ts. Amatuni, S.G. Arutunian, M.R. Mailian