TY  - RPRT
TI  - The preferred layout for numeral data-entry keysets.
AU  - R Conrad
AU  - A J Hull
PY  - 1968
DO  - 10.1080/00140136808930953
UR  - https://pubmed.ncbi.nlm.nih.gov/5648377/
ID  - 5648377
ER  -