TY  - RPRT
TI  - Envelope-function formalism for phonons in heterostructures.
AU  - H Akera
AU  - T Ando
PY  - 1989
DO  - 10.1103/physrevb.40.2914
UR  - https://pubmed.ncbi.nlm.nih.gov/9992222/
ID  - 9992222
ER  -