@misc{indiciae90801d71aabf,
  title = {General necessary conditions for optimization problems.},
  author = {H Halkin and L W Neustadt},
  year = {1966},
  doi = {10.1073/pnas.56.4.1066},
  url = {https://pubmed.ncbi.nlm.nih.gov/16591376/},
  note = {Source identifier: 16591376}
}