@misc{indiciae7ccde87bab06,
  title = {Simultaneous factor analysis of several Gramian matrices.},
  author = {J Levin},
  year = {1966},
  doi = {10.1007/bf02289472},
  url = {https://pubmed.ncbi.nlm.nih.gov/5221135/},
  note = {Source identifier: 5221135}
}