@incollection {MR1198032,
    AUTHOR = {Kawski, M.},
     TITLE = {High-order conditions for local controllability in practice},
 BOOKTITLE = {Recent advances in mathematical theory of systems, control,
              networks and signal processing, {II} ({K}obe, 1991)},
     PAGES = {271--276},
 PUBLISHER = {Mita},
   ADDRESS = {Tokyo},
      YEAR = {1992},
   MRCLASS = {93B05 (93C10)},
  MRNUMBER = {MR1198032},
}