@article{RM_1986_41_6_a7,
     author = {A. A. Agrachev and S. A. Vakhrameev},
     title = {Linearly controlled systems of constant rank and relay conditions for extreme control},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {199--200},
     publisher = {mathdoc},
     volume = {41},
     number = {6},
     year = {1986},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1986_41_6_a7/}
}