@article{PMIHES_1969__37__223_0,
     author = {John N. Mather},
     title = {Stability of $C^\infty $ mappings, {IV.} {Classification} of stable germs by $R$-algebras},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {223--248},
     year = {1969},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {37},
     doi = {10.1007/BF02684889},
     mrnumber = {43 #1215b},
     zbl = {0202.55102},
     language = {en},
     url = {https://pmihes.centre-mersenne.org/articles/10.1007/BF02684889/}
}