TY  - RPRT
TI  - Return current in encephalography. Variational principles.
AU  - L Heller
PY  - 1990
DO  - 10.1016/s0006-3495(90)82575-3
UR  - https://pubmed.ncbi.nlm.nih.gov/2306503/
ID  - 2306503
ER  -