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@article{MM2_1973__8_154136, author = {Michael Reeken}, title = {Stability of {Critical} {Points} under {Small} {Perturbations.} {Part} {II:} {Analytic} {Theory.}}, journal = {Manuscripta mathematica}, pages = {69--92}, publisher = {mathdoc}, volume = {8}, year = {1973}, zbl = {0248.58004}, url = {http://geodesic.mathdoc.fr/item/MM2_1973__8_154136/} }
Michael Reeken. Stability of Critical Points under Small Perturbations. Part II: Analytic Theory.. Manuscripta mathematica, Tome 8 (1973), pp. 69-92. http://geodesic.mathdoc.fr/item/MM2_1973__8_154136/