TY  - RPRT
TI  - [Factor analysis, rotation problem and implications for test construction. Optimal rotation procedure with empirical data (FPI)].
AU  - W W Wittmann
AU  - R Hampel
PY  - 1976
UR  - https://pubmed.ncbi.nlm.nih.gov/1028394/
ID  - 1028394
ER  -