NPE
X. He, D. Cai, S. Yan, H. Zhang, “Neighborhood preserving embedding”, IEEE International Conference on Computer Vision, ICCV 2005, 2005.
Orthogonal NPE
E. Kokiopoulou, Y. Saad, "Orthogonal neighborhood preserving projections: a projection-based dimensionality reduction technique", IEEE Transactions on Pattern Analysis and Machine Intelligence, Volume 29, Issue 12, pages 2143-2156, 2007.
Complete NPE (CNPE)
Y. Wang, Y. Wu, "Complete neighborhood preserving embedding for face recognition", Pattern Recognition, Volume 43, Issue 3, Pages 1008-1015, March 2009.
Flexible Orthogonal NPE (FPNPE)
T. Pang, F. Nie, J. Han,"Flexible Orthogonal Neighborhood Preserving Embedding", International Joint Conference on Artificial Intelligence, IJCAI 2017, 2017.
Sparse NPE
J. Gui, Z. Sun, W.Jia, R. Hu, Y. Lei, S. Ji"Discriminant sparse neighborhood preserving embedding for face recognition", Pattern Recognition, pages 2884-2893, 2012.