TY  - JOUR
T1  - On the Phosphorescent Spectra of S<latex>$ \delta $</latex> and Europium
JF  - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934)
VL  - 76
IS  - 511
SP  - 411
EP  - 414
PY  - 1905/08/04/
UR  - http://dx.doi.org/10.1098/rspa.1905.0043
M3  - doi:10.1098/rspa.1905.0043
AU  - Crookes, W.
ER  -