@article{JOLT_2009_19_1_a3,
     author = {P. J. Olver},
     title = {Differential {Invariants} of {Maximally} {Symmetric} {Submanifolds}},
     journal = {Journal of Lie Theory},
     pages = {79--99},
     year = {2009},
     volume = {19},
     number = {1},
     zbl = {1169.53012},
     url = {http://geodesic.mathdoc.fr/item/JOLT_2009_19_1_a3/}
}