TY  - RPRT
TI  - Pertinency of an extraneous variable.
AU  - I D Bross
PY  - 1967
DO  - 10.1016/0021-9681(67)90080-x
UR  - https://pubmed.ncbi.nlm.nih.gov/6028268/
ID  - 6028268
ER  -