@article{MAN_1973__204_162459,
     author = {R.W. jr. Richardson},
     title = {The {Variation} of {Isotropy} {Subalgebras} for {Analytic} {Transformation} {Goups.}},
     journal = {Mathematische Annalen},
     pages = {83--92},
     publisher = {mathdoc},
     volume = {204},
     year = {1973},
     zbl = {0266.57011},
     url = {http://geodesic.mathdoc.fr/item/MAN_1973__204_162459/}
}