TY  - RPRT
TI  - How do you spell 21 mm.
AU  - A Elami
AU  - L Caplan
AU  - E Rudis
PY  - 1999
DO  - 10.1016/s1010-7940(99)00148-7
UR  - https://pubmed.ncbi.nlm.nih.gov/10485433/
ID  - 10485433
ER  -