@article{10_4153_CJM_2002_033_x,
     author = {Ayuso, Pedro Fortuny},
     title = {The {Valuative} {Theory} of {Foliations}},
     journal = {Canadian journal of mathematics},
     pages = {897--915},
     year = {2002},
     volume = {54},
     number = {5},
     doi = {10.4153/CJM-2002-033-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2002-033-x/}
}