@misc{indiciae6f247314c56a,
  title = {A penalty approach for nonlinear optimization with discrete design variables},
  author = {Shin, Dong K. and Gurdal, Zafer and Griffin, O. H., Jr.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19890015846},
  note = {Source identifier: 19890015846}
}