@incollection {MR912300,
    AUTHOR = {Hermes, H. and Kawski, Matthias},
     TITLE = {Local controllability of a single input, affine system},
 BOOKTITLE = {Nonlinear analysis and applications ({A}rlington, {T}ex.,
              1986)},
    SERIES = {Lecture Notes in Pure and Appl. Math.},
    VOLUME = {109},
     PAGES = {235--248},
 PUBLISHER = {Dekker},
   ADDRESS = {New York},
      YEAR = {1987},
   MRCLASS = {93B05 (49E15 93D15)},
  MRNUMBER = {MR912300 (89h:93009)},
MRREVIEWER = {M. R{\u{a}}duic{\u{a}}},
}