@article{TM_2011_273_a0,
     author = {A. A. Agrachev and R. V. Gamkrelidze},
     title = {The geometry of maximum principle},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {5--27},
     publisher = {mathdoc},
     volume = {273},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2011_273_a0/}
}