@article{SM_2007_198_5_a5,
     author = {M. V. Milovanov},
     title = {Complete involutive sets of
},
     journal = {Sbornik. Mathematics},
     pages = {711--731},
     publisher = {mathdoc},
     volume = {198},
     number = {5},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2007_198_5_a5/}
}