TY  - JOUR
T1  - A Class of Functional Invariants. 
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 43
SP  - 431
EP  - 433
PY  - 1887/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1887.0165
M3  - doi:10.1098/rspl.1887.0165
AU  - Forsyth, A.
ER  -