@misc{indiciae433a1d637a4f,
  title = {A constrained EM algorithm for principal component analysis.},
  author = {Jong-Hoon Ahn and Jong-Hoon Oh},
  year = {2003},
  doi = {10.1162/089976603321043694},
  url = {https://pubmed.ncbi.nlm.nih.gov/12590819/},
  note = {Source identifier: 12590819}
}