TY  - JOUR
T1  - On a Photographic Method for Determining Variability in Stars. 
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 47
SP  - 137
EP  - 138
PY  - 1889/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1889.0074
M3  - doi:10.1098/rspl.1889.0074
AU  - Roberts, I.
ER  -