Imaging Processes and Coherence in Physics Proceedings of a Workshop, Held at the Centre de Physique, Les Houches, Frace, March 1979 - Schlenker, Michel 1940-; Fink, Mathias; Goedgebuer, J. P.; Malgrange, Cécile; Viénot, J. Ch; Wade, R. H. (Lecture notes in physics, 1980)