@inproceedings{Gitman:2007YL,
  author = "Gitman, Dmitry",
  title = "{Action principle for so-called non-Lagrangian systems}",
  doi = "10.22323/1.031.0016",
  booktitle = "Proceedings of Fifth International Conference on Mathematical Methods in Physics  {\textemdash} PoS(IC2006)",
  year = 2007,
  volume = "031",
  pages = "016"
}