@article{MZ_1995__218_4_174718,
     author = {Joachim Michel and Lan Ma},
     title = {On the regularity of {CR} structures for almost {CR} vector bundles.},
     journal = {Mathematische Zeitschrift},
     pages = {135--142},
     publisher = {mathdoc},
     volume = {218},
     number = {4},
     year = {1995},
     zbl = {0816.32016},
     url = {http://geodesic.mathdoc.fr/item/MZ_1995__218_4_174718/}
}