@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/}
}