@inproceedings{KimSteinHei09,
  title = {Semi-supervised Regression using Hessian energy with an application to semi-supervised dimensionality reduction},
  booktitle = {Advances in Neural Information Processing Systems 22 (NIPS)},
  pages = {979--987},
  editors = {Y. Bengio and D. Schuurmans and J. Lafferty and C. Williams and A. Culotta},
  publisher = {Curran Associates, Inc.},
  month = dec,
  year = {2009},
  author = {Kim, K. and Steinke, F. and Hein, M.},
  url = {https://proceedings.neurips.cc/paper/2009/file/f4552671f8909587cf485ea990207f3b-Paper.pdf},
  month_numeric = {12}
}