@misc{indiciae9c70f345d410,
  title = {Nonparametric maximum likelihood estimation of probability densities by penalty function methods},
  author = {Demontricher, G. F. and Tapia, R. A. and Thompson, J. R.},
  year = {1974},
  url = {https://ntrs.nasa.gov/citations/19750022788},
  note = {Source identifier: 19750022788}
}