@article {MR1982742,
    AUTHOR = {Bianchini, Rosa-Maria and Kawski, Matthias},
     TITLE = {Needle variations that cannot be summed},
   JOURNAL = {SIAM J. Control Optim.},
  FJOURNAL = {SIAM Journal on Control and Optimization},
    VOLUME = {42},
      YEAR = {2003},
    NUMBER = {1},
     PAGES = {218--238 (electronic)},
      ISSN = {0363-0129},
   MRCLASS = {49K15 (93B05)},
  MRNUMBER = {MR1982742 (2004b:49042)},
MRREVIEWER = {Henry Hermes},
}