TWO-PHONON BOUND STATES IN AMMONIUM CHLORIDE AT FINITE TEMPERATURES A. A. Anikiev, B. S. Umarov, V. S. Gorelik et J. F. VetelinoJ. Phys. Colloques, 42 C6 (1981) C6-152-C6-154DOI: https://doi.org/10.1051/jphyscol:1981646
