M. Dimassi, J.-C.Guillot and J. Ralston
Semi-Classical Asymptotics in Magnetic Bloch Bands.
(154K, Postscript)

ABSTRACT.   This article gives a simple construction of wave 
packets localized near semi-classical trajectories for an 
electron subject to external electric and magnetic fields. 
We assume that the magnetic and electric potentials are 
slowly varying perturbations of the potential of a constant 
magnetic field and a periodic lattice potential, respectively.