TY  - RPRT
TI  - Preops: a communication technic.
AU  - C J Kramer
PY  - 1971
DO  - 10.1016/s0001-2092(07)67348-7
UR  - https://pubmed.ncbi.nlm.nih.gov/5209708/
ID  - 5209708
ER  -