@misc{indiciae730e956bab95,
  title = {[Factor analysis, rotation problem and implications for test construction. Optimal rotation procedure with empirical data (FPI)].},
  author = {W W Wittmann and R Hampel},
  year = {1976},
  url = {https://pubmed.ncbi.nlm.nih.gov/1028394/},
  note = {Source identifier: 1028394}
}