TY  - JOUR
T1  - On an Extended Form of the Index Symbol in the Calculus of Operations. 
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 10
SP  - 207
EP  - 208
PY  - 1859/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1859.0044
M3  - doi:10.1098/rspl.1859.0044
AU  - Spottiswoode, W.
ER  -