TY  - GEN
AU  - Smith,Tristan L
AU  - Pierpaoli,Elena
AU  - Kamionkowski,Marc
TI  - New cosmic microwave background constraint to primordial gravitational waves
SN  - 0031-9007
PY  - 2007///0206
N1  - Publication Type: Journal Article
UR  - https://doi.org/10.1103/PhysRevLett.97.021301
ER  -