TY  - RPRT
TI  - The principles and the PEA.
AU  - J M Christenson
PY  - 1995
DO  - 10.1111/j.1553-2712.1995.tb03141.x
UR  - https://pubmed.ncbi.nlm.nih.gov/8597910/
ID  - 8597910
ER  -