@incollection {MR2024217,
    AUTHOR = {Kawski, Matthias},
     TITLE = {High-order maximal principles},
 BOOKTITLE = {New trends in nonlinear dynamics and control, and their
              applications},
    SERIES = {Lecture Notes in Control and Inform. Sci.},
    VOLUME = {295},
     PAGES = {313--326},
 PUBLISHER = {Springer},
   ADDRESS = {Berlin},
      YEAR = {2003},
   MRCLASS = {49K15 (93C15)},
  MRNUMBER = {MR2024217 (2005a:49042)},
MRREVIEWER = {Andrei V. Dmitruk},
}