The Parameterized Simulation of Electromagnetic Showers in Homogeneous   and Sampling Calorimeters
  A general approach to a fast simulation of electromagnetic showers using parameterizations of the longitudinal and radial profiles in homogeneous and sampling calorimeters is described. The dependence of the shower development on the materials used and the sampling geometry is taken into account explicitly. Comparisons with detailed simulations of various calorimeters and with data from the liquid argon calorimeter of the H1 experiment are made. 
G.Grindhammer, S. Peters (MPI Munich)