OBSERVATION OF STRONGLY FREQUENCY DEPENDENT LIFETIMES OF ACOUSTIC PHONONS IN CaF2 R. Baumgartner, M. Engelhardt et K. F. RenkJ. Phys. Colloques, 42 C6 (1981) C6-119-C6-121DOI: https://doi.org/10.1051/jphyscol:1981635
