- Damour & Schafer 1991
(PSR B1855+09)
Relativistic precession?
Finite probability that 
and 
cancel due to precession
If precession time << age and Galactic orbit time, deal with
precession statistically and obtain upper limit
With several pulsars, probabilities mulitply!
- Wex 1996 (7 MSPs)
Same as weak field limit