FOUR-WAVE MIXING TECHNIQUE AND COHERENCE EFFECT ON ELECTRONIC STATES OF DYE MOLECULE M. T. PORTELLA, P. MONTELMACHER, A. BOURDON, P. EVESQUE et J. DURANJ. Phys. Colloques, 48 C7 (1987) C7-521-C7-523DOI: https://doi.org/10.1051/jphyscol:19877124