TY  - JOUR
T1  - On a Class of Invariants. 
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 33
SP  - 215
EP  - 215
PY  - 1881/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1881.0096
M3  - doi:10.1098/rspl.1881.0096
AU  - Malet, J.
ER  -