@INPROCEEDINGS{ist:michalowsky16a,
  author = {Michalowsky, S. and Ebenbauer, C.},
  title = {Gradient approximation and extremum seeking via needle variations},
  booktitle = {Proc.\ American Control Conf.\ (ACC)},
  year = {2016},
  pages = {6091-6096},
  address = {Boston, MA, USA},
  pubtype = {proceeding}
}