TY  - RPRT
TI  - Spurious effects from an extraneous variable.
AU  - I D Bross
PY  - 1966
DO  - 10.1016/0021-9681(66)90062-2
UR  - https://pubmed.ncbi.nlm.nih.gov/5966011/
ID  - 5966011
ER  -