TY  - JOUR
T1  - On the Periodicity of Sun-Spots
JF  - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934)
VL  - 85
IS  - 575
SP  - 50
EP  - 53
PY  - 1911/03/14/
UR  - http://dx.doi.org/10.1098/rspa.1911.0020
M3  - doi:10.1098/rspa.1911.0020
AU  - Schuster, A.
ER  -