  We present a simple theory for the description of the single particle
excitations in the Kondo lattice model. Thereby we derive an `effective
Hamiltonian' which describes the coherent propagation of single particle-like
fluctuations on a strong coupling background. Even for f-electrons which are
replaced by Kondo-spins, the resulting spectral function obeys the Luttinger
theorem including the f-electrons, and our calculation fully reproduces the
nontrivial variation of the spectral function and momentum distribution with
electron density and parameter values as seen in exact diagonalization and
density matrix renormalization group studies.
