TY  - GEN
AU  - Hearn,M
TI  - Black rubber or clear plastic delivery tubing for nitrous oxide: patient preference
SN  - 0959-289X
PY  - 2006///0131
N1  - Publication Type: Journal Article
UR  - https://doi.org/10.1016/0959-289x(93)90028-g
ER  -