@misc{indiciae12efa953d92e,
  title = {A method for nonlinear optimization with discrete design variables},
  author = {Olsen, Gregory R. and Vanderplaats, Garret N.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19870046316},
  note = {Source identifier: 19870046316}
}