@article{PM_1994_1994_1_a4,
     author = {Wolak, Robert A.},
     title = {Teorema de {Pierrot} para foliaciones riemannianas singulares.},
     journal = {Publicacions matem\`atiques},
     pages = {433-439},
     publisher = {mathdoc},
     volume = {38},
     number = {2},
     year = {1994},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_1994_1994_1_a4/}
}