TY - JOUR T1 - On a Class of Invariants JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 173 SP - 751 EP - 776 PY - 1882/01/01/ UR - http://dx.doi.org/10.1098/rstl.1882.0016 M3 - doi:10.1098/rstl.1882.0016 AU - Malet, J. ER -