TY  - RPRT
TI  - [The class effect].
AU  - Jesús Honorato Pérez
PY  - 2003
DO  - 10.1016/s0025-7753(03)74021-4
UR  - https://pubmed.ncbi.nlm.nih.gov/14622525/
ID  - 14622525
ER  -