@article{GDZPPN002216981,
title = {Stability of Critical Points under Small Perturbations. Part II: Analytic Theory.},
journal = {Manuscripta mathematica},
volume = {11},
year = {1973},
pages = {69-92},
zbl = {0248.58004},
url = {http://dml.mathdoc.fr/item/GDZPPN002216981}
}
Reeken, Michael. Stability of Critical Points under Small Perturbations. Part II: Analytic Theory.. Manuscripta mathematica, Tome 11 (1973) pp. 69-92. http://gdmltest.u-ga.fr/item/GDZPPN002216981/