@article{CRMATH_2002__334_12_1101_0,
     author = {Patrick Popescu-Pampu},
     title = {On the invariance of the semigroup of a quasi-ordinary surface singularity},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {1101--1106},
     publisher = {Elsevier},
     volume = {334},
     number = {12},
     year = {2002},
     doi = {10.1016/S1631-073X(02)02404-4},
     language = {en},
}