TY  - RPRT
TI  - Eigenvalue equation for a general periodic potential and its multipole expansion solution.
AU  - E Badralexe
AU  - AJ Freeman
PY  - 1988
DO  - 10.1103/physrevb.37.1067
UR  - https://pubmed.ncbi.nlm.nih.gov/9944613/
ID  - 9944613
ER  -