TY  - RPRT
TI  - Evaluation of various approximations used in the envelope-function method.
AU  - AT Meney
AU  - B Gonul
AU  - EP O'Reilly
PY  - 1994
DO  - 10.1103/physrevb.50.10893
UR  - https://pubmed.ncbi.nlm.nih.gov/9975192/
ID  - 9975192
ER  -