GENERALIZATION OF FRÖHLICH'S OPERATOR FOR THE ELECTRON-PHONON COUPLING IN POLAR CRYSTALS U. Schröder, M. Weiss, R. Reiger et J. B. PageJ. Phys. Colloques, 42 C6 (1981) C6-496-C6-498DOI: https://doi.org/10.1051/jphyscol:19816145
