TY  - JOUR
T1  - On Permanent Periodicity in Sunspots
JF  - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934)
VL  - 93
IS  - 654
SP  - 493
EP  - 506
PY  - 1917/09/01/
UR  - http://dx.doi.org/10.1098/rspa.1917.0034
M3  - doi:10.1098/rspa.1917.0034
AU  - Larmor, J.
AU  - Yamaga, N.
ER  -