TY  - RPRT
TI  - To know chalk from cheese.
AU  - M B Izzat
AU  - A P Yim
DO  - 10.1111/j.1540-8191.1997.tb00151.x
UR  - https://pubmed.ncbi.nlm.nih.gov/9635275/
ID  - 9635275
ER  -