@article{IM2_2008_72_2_a6,
     author = {R. A. Sarkisyan and I. G. Shandra},
     title = {Regularity and {Tresse's} theorem for geometric structures},
     journal = {Izvestiya. Mathematics },
     pages = {345--382},
     publisher = {mathdoc},
     volume = {72},
     number = {2},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2008_72_2_a6/}
}