TY  - RPRT
TI  - Physical sciences: sunspots and planetary orbits.
AU  - R A Bureau
AU  - L B Craine
PY  - 1970
DO  - 10.1038/228984a0
UR  - https://pubmed.ncbi.nlm.nih.gov/16059025/
ID  - 16059025
ER  -