@article{10_4064_ap_56_2_187_194,
     author = {Jes\'us Alvarez L\'opez},
     title = {A type of non-equivalent pseudogroups. {Application} to foliations},
     journal = {Annales Polonici Mathematici},
     pages = {187--194},
     publisher = {mathdoc},
     volume = {56},
     number = {2},
     year = {1991},
     doi = {10.4064/ap-56-2-187-194},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-56-2-187-194/}
}