TY  - RPRT
TI  - Sferics and headache: a prospective study.
AU  - H Walach
AU  - H D Betz
AU  - A Schweickhardt
PY  - 2001
DO  - 10.1046/j.1468-2982.2001.00230.x
UR  - https://pubmed.ncbi.nlm.nih.gov/11531901/
ID  - 11531901
ER  -