@article{PM_1989_1989_1_a27,
     author = {Vaisman, Izu},
     title = {Fundamentos de las foliaciones de {Lagrange.}},
     journal = {Publicacions matem\`atiques},
     pages = {559-575},
     year = {1989},
     volume = {33},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_1989_1989_1_a27/}
}