@article{10_4153_CMB_1971_057_x,
     author = {Cohen, Maurice},
     title = {Approximation of {Foliations}},
     journal = {Canadian mathematical bulletin},
     pages = {311--314},
     year = {1971},
     volume = {14},
     number = {3},
     doi = {10.4153/CMB-1971-057-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1971-057-x/}
}