TY  - JOUR
T1  - On Internal and External Division in the Calculus of Symbols. 
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 11
SP  - 557
EP  - 558
PY  - 1860/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1860.0121
M3  - doi:10.1098/rspl.1860.0121
AU  - Spottiswoode, W.
ER  -