TY  - RPRT
TI  - Descriptive statistics.
AU  - J S Bulman
AU  - J F Osborn
PY  - 1989
DO  - 10.1038/sj.bdj.4806708
UR  - https://pubmed.ncbi.nlm.nih.gov/2917091/
ID  - 2917091
ER  -